XPath的<和>运算符需要转义吗？（转义.运算符.XPath.lt.gt...）

&amp;amp;amp;amp;amp;lt;blockquote&amp;amp;amp;amp;amp;gt;XPath运算符无需转义，直接使用+、-、*、=、and、or等；但在XML属性中需对<、>、&amp;amp;amp;amp;amp;amp;amp;等字符进行XML实体转义，如<、>、&amp;amp;amp;amp;amp;amp;amp;；字符串引号冲突时用单双引号互避，或concat()函数拼接。&amp;amp;amp;amp;amp;lt;/blockquote&amp;amp;amp;amp;amp;gt; &amp;amp;amp;amp;amp;lt;p&amp;amp;amp;amp;amp;gt;&amp;amp;amp;amp;amp;lt;img src=&amp;amp;amp;amp;amp;amp;quot;https://img.php.cn/upload/article/001/221/864/175544532686015.jpg&amp;amp;amp;amp;amp;amp;quot; alt=&amp;amp;amp;amp;amp;amp;quot;xpath的&amp;amp;amp;amp;amp;amp;lt;和&amp;amp;amp;amp;amp;amp;gt;运算符需要转义吗？&amp;amp;amp;amp;amp;amp;quot;&amp;amp;amp;amp;amp;gt;&amp;amp;amp;amp;amp;lt;/p&amp;amp;amp;amp;amp;gt; &amp;amp;amp;amp;amp;lt;p&amp;amp;amp;amp;amp;gt;XPath的运算符本身，在XPath表达式内部使用时，通常不需要“转义”。它们是语言的组成部分，直接书写即可，比如&amp;amp;amp;amp;amp;lt;div class=&amp;amp;amp;amp;amp;amp;quot;code&amp;amp;amp;amp;amp;amp;quot; style=&amp;amp;amp;amp;amp;amp;quot;position:relative; padding:0px; margin:0px;&amp;amp;amp;amp;amp;amp;quot;&amp;amp;amp;amp;amp;gt;&amp;amp;amp;amp;amp;lt;pre class=&amp;amp;amp;amp;amp;amp;quot;brush:php;toolbar:false;&amp;amp;amp;amp;amp;amp;quot;&amp;amp;amp;amp;amp;gt;+&amp;amp;amp;amp;amp;lt;/pre&amp;amp;amp;amp;amp;gt;&amp;amp;amp;amp;amp;lt;div class=&amp;amp;amp;amp;amp;amp;quot;contentsignin&amp;amp;amp;amp;amp;amp;quot;&amp;amp;amp;amp;amp;gt; &amp;amp;amp;amp;amp;lt;/div&amp;amp;amp;amp;amp;gt;&amp;amp;amp;amp;amp;lt;/div&amp;amp;amp;amp;amp;gt;、&amp;amp;amp;amp;amp;lt;div class=&amp;amp;amp;amp;amp;amp;quot;code&amp;amp;amp;amp;amp;amp;quot; style=&amp;amp;amp;amp;amp;amp;quot;position:relative; padding:0px; margin:0px;&amp;amp;amp;amp;amp;amp;quot;&amp;amp;amp;amp;amp;gt;&amp;amp;amp;amp;amp;lt;pre class=&amp;amp;amp;amp;amp;amp;quot;brush:php;toolbar:false;&amp;amp;amp;amp;amp;amp;quot;&amp;amp;amp;amp;amp;gt;-&amp;amp;amp;amp;amp;lt;/pre&amp;amp;amp;amp;amp;gt;&amp;amp;amp;amp;amp;lt;div class=&amp;amp;amp;amp;amp;amp;quot;contentsignin&amp;amp;amp;amp;amp;amp;quot;&amp;amp;amp;amp;amp;gt; &amp;amp;amp;amp;amp;lt;/div&amp;amp;amp;amp;amp;gt;&amp;amp;amp;amp;amp;lt;/div&amp;amp;amp;amp;amp;gt;、&amp;amp;amp;amp;amp;lt;div class=&amp;amp;amp;amp;amp;amp;quot;code&amp;amp;amp;amp;amp;amp;quot; style=&amp;amp;amp;amp;amp;amp;quot;position:relative; padding:0px; margin:0px;&amp;amp;amp;amp;amp;amp;quot;&amp;amp;amp;amp;amp;gt;&amp;amp;amp;amp;amp;lt;pre class=&amp;amp;amp;amp;amp;amp;quot;brush:php;toolbar:false;&amp;amp;amp;amp;amp;amp;quot;&amp;amp;amp;amp;amp;gt;*&amp;amp;amp;amp;amp;lt;/pre&amp;amp;amp;amp;amp;gt;&amp;amp;amp;amp;amp;lt;div class=&amp;amp;amp;amp;amp;amp;quot;contentsignin&amp;amp;amp;amp;amp;amp;quot;&amp;amp;amp;amp;amp;gt; &amp;amp;amp;amp;amp;lt;/div&amp;amp;amp;amp;amp;gt;&amp;amp;amp;amp;amp;lt;/div&amp;amp;amp;amp;amp;gt;、&amp;amp;amp;amp;amp;lt;div class=&amp;amp;amp;amp;amp;amp;quot;code&amp;amp;amp;amp;amp;amp;quot; style=&amp;amp;amp;amp;amp;amp;quot;position:relative; padding:0px; margin:0px;&amp;amp;amp;amp;amp;amp;quot;&amp;amp;amp;amp;amp;gt;&amp;amp;amp;amp;amp;lt;div class=&amp;amp;amp;amp;amp;amp;quot;code&amp;amp;amp;amp;amp;amp;quot; style=&amp;amp;amp;amp;amp;amp;quot;position:relative; padding:0px; margin:0px;&amp;amp;amp;amp;amp;amp;quot;&amp;amp;amp;amp;amp;gt;&amp;amp;amp;amp;amp;lt;pre class=&amp;amp;amp;amp;amp;amp;quot;brush:php;toolbar:false;&amp;amp;amp;amp;amp;amp;quot;&amp;amp;amp;amp;amp;gt;=&amp;amp;amp;amp;amp;lt;/pre&amp;amp;amp;amp;amp;gt;&amp;amp;amp;amp;amp;lt;div class=&amp;amp;amp;amp;amp;amp;quot;contentsignin&amp;amp;amp;amp;amp;amp;quot;&amp;amp;amp;amp;amp;gt; &amp;amp;amp;amp;amp;lt;/div&amp;amp;amp;amp;amp;gt;&amp;amp;amp;amp;amp;lt;/div&amp;amp;amp;amp;amp;gt;&amp;amp;amp;amp;amp;lt;div class=&amp;amp;amp;amp;amp;amp;quot;contentsignin&amp;amp;amp;amp;amp;amp;quot;&amp;amp;amp;amp;amp;gt; &amp;amp;amp;amp;amp;lt;/div&amp;amp;amp;amp;amp;gt;&amp;amp;amp;amp;amp;lt;/div&amp;amp;amp;amp;amp;gt;、&amp;amp;amp;amp;amp;lt;div class=&amp;amp;amp;amp;amp;amp;quot;code&amp;amp;amp;amp;amp;amp;quot; style=&amp;amp;amp;amp;amp;amp;quot;position:relative; padding:0px; margin:0px;&amp;amp;amp;amp;amp;amp;quot;&amp;amp;amp;amp;amp;gt;&amp;amp;amp;amp;amp;lt;div class=&amp;amp;amp;amp;amp;amp;quot;code&amp;amp;amp;amp;amp;amp;quot; style=&amp;amp;amp;amp;amp;amp;quot;position:relative; padding:0px; margin:0px;&amp;amp;amp;amp;amp;amp;quot;&amp;amp;amp;amp;amp;gt;&amp;amp;amp;amp;amp;lt;div class=&amp;amp;amp;amp;amp;amp;quot;code&amp;amp;amp;amp;amp;amp;quot; style=&amp;amp;amp;amp;amp;amp;quot;position:relative; padding:0px; margin:0px;&amp;amp;amp;amp;amp;amp;quot;&amp;amp;amp;amp;amp;gt;&amp;amp;amp;amp;amp;lt;div class=&amp;amp;amp;amp;amp;amp;quot;code&amp;amp;amp;amp;amp;amp;quot; style=&amp;amp;amp;amp;amp;amp;quot;position:relative; padding:0px; margin:0px;&amp;amp;amp;amp;amp;amp;quot;&amp;amp;amp;amp;amp;gt;&amp;amp;amp;amp;amp;lt;div class=&amp;amp;amp;amp;amp;amp;quot;code&amp;amp;amp;amp;amp;amp;quot; style=&amp;amp;amp;amp;amp;amp;quot;position:relative; padding:0px; margin:0px;&amp;amp;amp;amp;amp;amp;quot;&amp;amp;amp;amp;amp;gt;&amp;amp;amp;amp;amp;lt;pre class=&amp;amp;amp;amp;amp;amp;quot;brush:php;toolbar:false;&amp;amp;amp;amp;amp;amp;quot;&amp;amp;amp;amp;amp;gt;and&amp;amp;amp;amp;amp;lt;/pre&amp;amp;amp;amp;amp;gt;&amp;amp;amp;amp;amp;lt;div class=&amp;amp;amp;amp;amp;amp;quot;contentsignin&amp;amp;amp;amp;amp;amp;quot;&amp;amp;amp;amp;amp;gt; &amp;amp;amp;amp;amp;lt;/div&amp;amp;amp;amp;amp;gt;&amp;amp;amp;amp;amp;lt;/div&amp;amp;amp;amp;amp;gt;&amp;amp;amp;amp;amp;lt;div class=&amp;amp;amp;amp;amp;amp;quot;contentsignin&amp;amp;amp;amp;amp;amp;quot;&amp;amp;amp;amp;amp;gt; &amp;amp;amp;amp;amp;lt;/div&amp;amp;amp;amp;amp;gt;&amp;amp;amp;amp;amp;lt;/div&amp;amp;amp;amp;amp;gt;&amp;amp;amp;amp;amp;lt;div class=&amp;amp;amp;amp;amp;amp;quot;contentsignin&amp;amp;amp;amp;amp;amp;quot;&amp;amp;amp;amp;amp;gt; &amp;amp;amp;amp;amp;lt;/div&amp;amp;amp;amp;amp;gt;&amp;amp;amp;amp;amp;lt;/div&amp;amp;amp;amp;amp;gt;&amp;amp;amp;amp;amp;lt;div class=&amp;amp;amp;amp;amp;amp;quot;contentsignin&amp;amp;amp;amp;amp;amp;quot;&amp;amp;amp;amp;amp;gt; &amp;amp;amp;amp;amp;lt;/div&amp;amp;amp;amp;amp;gt;&amp;amp;amp;amp;amp;lt;/div&amp;amp;amp;amp;amp;gt;&amp;amp;amp;amp;amp;lt;div class=&amp;amp;amp;amp;amp;amp;quot;contentsignin&amp;amp;amp;amp;amp;amp;quot;&amp;amp;amp;amp;amp;gt; &amp;amp;amp;amp;amp;lt;/div&amp;amp;amp;amp;amp;gt;&amp;amp;amp;amp;amp;lt;/div&amp;amp;amp;amp;amp;gt;、&amp;amp;amp;amp;amp;lt;div class=&amp;amp;amp;amp;amp;amp;quot;code&amp;amp;amp;amp;amp;amp;quot; style=&amp;amp;amp;amp;amp;amp;quot;position:relative; padding:0px; margin:0px;&amp;amp;amp;amp;amp;amp;quot;&amp;amp;amp;amp;amp;gt;&amp;amp;amp;amp;amp;lt;div class=&amp;amp;amp;amp;amp;amp;quot;code&amp;amp;amp;amp;amp;amp;quot; style=&amp;amp;amp;amp;amp;amp;quot;position:relative; padding:0px; margin:0px;&amp;amp;amp;amp;amp;amp;quot;&amp;amp;amp;amp;amp;gt;&amp;amp;amp;amp;amp;lt;div class=&amp;amp;amp;amp;amp;amp;quot;code&amp;amp;amp;amp;amp;amp;quot; style=&amp;amp;amp;amp;amp;amp;quot;position:relative; padding:0px; margin:0px;&amp;amp;amp;amp;amp;amp;quot;&amp;amp;amp;amp;amp;gt;&amp;amp;amp;amp;amp;lt;pre class=&amp;amp;amp;amp;amp;amp;quot;brush:php;toolbar:false;&amp;amp;amp;amp;amp;amp;quot;&amp;amp;amp;amp;amp;gt;or&amp;amp;amp;amp;amp;lt;/pre&amp;amp;amp;amp;amp;gt;&amp;amp;amp;amp;amp;lt;div class=&amp;amp;amp;amp;amp;amp;quot;contentsignin&amp;amp;amp;amp;amp;amp;quot;&amp;amp;amp;amp;amp;gt; &amp;amp;amp;amp;amp;lt;/div&amp;amp;amp;amp;amp;gt;&amp;amp;amp;amp;amp;lt;/div&amp;amp;amp;amp;amp;gt;&amp;amp;amp;amp;amp;lt;div class=&amp;amp;amp;amp;amp;amp;quot;contentsignin&amp;amp;amp;amp;amp;amp;quot;&amp;amp;amp;amp;amp;gt; &amp;amp;amp;amp;amp;lt;/div&amp;amp;amp;amp;amp;gt;&amp;amp;amp;amp;amp;lt;/div&amp;amp;amp;amp;amp;gt;&amp;amp;amp;amp;amp;lt;div class=&amp;amp;amp;amp;amp;amp;quot;contentsignin&amp;amp;amp;amp;amp;amp;quot;&amp;amp;amp;amp;amp;gt; &amp;amp;amp;amp;amp;lt;/div&amp;amp;amp;amp;amp;gt;&amp;amp;amp;amp;amp;lt;/div&amp;amp;amp;amp;amp;gt;等等。但如果你的XPath表达式字符串本身被嵌入到其他语言环境（例如XML属性值、编程语言的&amp;amp;amp;amp;amp;lt;a style=&amp;amp;amp;amp;amp;amp;quot;color:#f60; text-decoration:underline;&amp;amp;amp;amp;amp;amp;quot; title=&amp;amp;amp;amp;amp;amp;quot;字符串常量&amp;amp;amp;amp;amp;amp;quot; href=&amp;amp;amp;amp;amp;amp;quot;https://www.php.cn/zt/81514.html&amp;amp;amp;amp;amp;amp;quot; target=&amp;amp;amp;amp;amp;amp;quot;_blank&amp;amp;amp;amp;amp;amp;quot;&amp;amp;amp;amp;amp;gt;字符串常量&amp;amp;amp;amp;amp;lt;/a&amp;amp;amp;amp;amp;gt;）中，那么这些外部语言的规则可能会要求你对XPath字符串中的特定字符进行转义，这与XPath运算符本身无关，而是外部语言的语法要求。真正的挑战往往出现在字符串字面量中的引号处理，以及当XPath表达式作为XML属性值时对XML特殊字符的转义。&amp;amp;amp;amp;amp;lt;/p&amp;amp;amp;amp;amp;gt; &amp;amp;amp;amp;amp;lt;h3&amp;amp;amp;amp;amp;gt;解决方案&amp;amp;amp;amp;amp;lt;/h3&amp;amp;amp;amp;amp;gt; &amp;amp;amp;amp;amp;lt;p&amp;amp;amp;amp;amp;gt;我们在写XPath的时候，直观上会觉得某些符号是不是得特别处理一下，尤其当你从其他编程语言的背景看过来。但对于XPath的核心运算符，比如加减乘除、逻辑判断（&amp;amp;amp;amp;amp;lt;div class=&amp;amp;amp;amp;amp;amp;quot;code&amp;amp;amp;amp;amp;amp;quot; style=&amp;amp;amp;amp;amp;amp;quot;position:relative; padding:0px; margin:0px;&amp;amp;amp;amp;amp;amp;quot;&amp;amp;amp;amp;amp;gt;&amp;amp;amp;amp;amp;lt;div class=&amp;amp;amp;amp;amp;amp;quot;code&amp;amp;amp;amp;amp;amp;quot; style=&amp;amp;amp;amp;amp;amp;quot;position:relative; padding:0px; margin:0px;&amp;amp;amp;amp;amp;amp;quot;&amp;amp;amp;amp;amp;gt;&amp;amp;amp;amp;amp;lt;div class=&amp;amp;amp;amp;amp;amp;quot;code&amp;amp;amp;amp;amp;amp;quot; style=&amp;amp;amp;amp;amp;amp;quot;position:relative; padding:0px; margin:0px;&amp;amp;amp;amp;amp;amp;quot;&amp;amp;amp;amp;amp;gt;&amp;amp;amp;amp;amp;lt;div class=&amp;amp;amp;amp;amp;amp;quot;code&amp;amp;amp;amp;amp;amp;quot; style=&amp;amp;amp;amp;amp;amp;quot;position:relative; padding:0px; margin:0px;&amp;amp;amp;amp;amp;amp;quot;&amp;amp;amp;amp;amp;gt;&amp;amp;amp;amp;amp;lt;div class=&amp;amp;amp;amp;amp;amp;quot;code&amp;amp;amp;amp;amp;amp;quot; style=&amp;amp;amp;amp;amp;amp;quot;position:relative; padding:0px; margin:0px;&amp;amp;amp;amp;amp;amp;quot;&amp;amp;amp;amp;amp;gt;&amp;amp;amp;amp;amp;lt;pre class=&amp;amp;amp;amp;amp;amp;quot;brush:php;toolbar:false;&amp;amp;amp;amp;amp;amp;quot;&amp;amp;amp;amp;amp;gt;and&amp;amp;amp;amp;amp;lt;/pre&amp;amp;amp;amp;amp;gt;&amp;amp;amp;amp;amp;lt;div class=&amp;amp;amp;amp;amp;amp;quot;contentsignin&amp;amp;amp;amp;amp;amp;quot;&amp;amp;amp;amp;amp;gt; &amp;amp;amp;amp;amp;lt;/div&amp;amp;amp;amp;amp;gt;&amp;amp;amp;amp;amp;lt;/div&amp;amp;amp;amp;amp;gt;&amp;amp;amp;amp;amp;lt;div class=&amp;amp;amp;amp;amp;amp;quot;contentsignin&amp;amp;amp;amp;amp;amp;quot;&amp;amp;amp;amp;amp;gt; &amp;amp;amp;amp;amp;lt;/div&amp;amp;amp;amp;amp;gt;&amp;amp;amp;amp;amp;lt;/div&amp;amp;amp;amp;amp;gt;&amp;amp;amp;amp;amp;lt;div class=&amp;amp;amp;amp;amp;amp;quot;contentsignin&amp;amp;amp;amp;amp;amp;quot;&amp;amp;amp;amp;amp;gt; &amp;amp;amp;amp;amp;lt;/div&amp;amp;amp;amp;amp;gt;&amp;amp;amp;amp;amp;lt;/div&amp;amp;amp;amp;amp;gt;&amp;amp;amp;amp;amp;lt;div class=&amp;amp;amp;amp;amp;amp;quot;contentsignin&amp;amp;amp;amp;amp;amp;quot;&amp;amp;amp;amp;amp;gt; &amp;amp;amp;amp;amp;lt;/div&amp;amp;amp;amp;amp;gt;&amp;amp;amp;amp;amp;lt;/div&amp;amp;amp;amp;amp;gt;&amp;amp;amp;amp;amp;lt;div class=&amp;amp;amp;amp;amp;amp;quot;contentsignin&amp;amp;amp;amp;amp;amp;quot;&amp;amp;amp;amp;amp;gt; &amp;amp;amp;amp;amp;lt;/div&amp;amp;amp;amp;amp;gt;&amp;amp;amp;amp;amp;lt;/div&amp;amp;amp;amp;amp;gt;, &amp;amp;amp;amp;amp;lt;div class=&amp;amp;amp;amp;amp;amp;quot;code&amp;amp;amp;amp;amp;amp;quot; style=&amp;amp;amp;amp;amp;amp;quot;position:relative; padding:0px; margin:0px;&amp;amp;amp;amp;amp;amp;quot;&amp;amp;amp;amp;amp;gt;&amp;amp;amp;amp;amp;lt;div class=&amp;amp;amp;amp;amp;amp;quot;code&amp;amp;amp;amp;amp;amp;quot; style=&amp;amp;amp;amp;amp;amp;quot;position:relative; padding:0px; margin:0px;&amp;amp;amp;amp;amp;amp;quot;&amp;amp;amp;amp;amp;gt;&amp;amp;amp;amp;amp;lt;div class=&amp;amp;amp;amp;amp;amp;quot;code&amp;amp;amp;amp;amp;amp;quot; style=&amp;amp;amp;amp;amp;amp;quot;position:relative; padding:0px; margin:0px;&amp;amp;amp;amp;amp;amp;quot;&amp;amp;amp;amp;amp;gt;&amp;amp;amp;amp;amp;lt;pre class=&amp;amp;amp;amp;amp;amp;quot;brush:php;toolbar:false;&amp;amp;amp;amp;amp;amp;quot;&amp;amp;amp;amp;amp;gt;or&amp;amp;amp;amp;amp;lt;/pre&amp;amp;amp;amp;amp;gt;&amp;amp;amp;amp;amp;lt;div class=&amp;amp;amp;amp;amp;amp;quot;contentsignin&amp;amp;amp;amp;amp;amp;quot;&amp;amp;amp;amp;amp;gt; &amp;amp;amp;amp;amp;lt;/div&amp;amp;amp;amp;amp;gt;&amp;amp;amp;amp;amp;lt;/div&amp;amp;amp;amp;amp;gt;&amp;amp;amp;amp;amp;lt;div class=&amp;amp;amp;amp;amp;amp;quot;contentsignin&amp;amp;amp;amp;amp;amp;quot;&amp;amp;amp;amp;amp;gt; &amp;amp;amp;amp;amp;lt;/div&amp;amp;amp;amp;amp;gt;&amp;amp;amp;amp;amp;lt;/div&amp;amp;amp;amp;amp;gt;&amp;amp;amp;amp;amp;lt;div class=&amp;amp;amp;amp;amp;amp;quot;contentsignin&amp;amp;amp;amp;amp;amp;quot;&amp;amp;amp;amp;amp;gt; &amp;amp;amp;amp;amp;lt;/div&amp;amp;amp;amp;amp;gt;&amp;amp;amp;amp;amp;lt;/div&amp;amp;amp;amp;amp;gt;, &amp;amp;amp;amp;amp;lt;div class=&amp;amp;amp;amp;amp;amp;quot;code&amp;amp;amp;amp;amp;amp;quot; style=&amp;amp;amp;amp;amp;amp;quot;position:relative; padding:0px; margin:0px;&amp;amp;amp;amp;amp;amp;quot;&amp;amp;amp;amp;amp;gt;&amp;amp;amp;amp;amp;lt;pre class=&amp;amp;amp;amp;amp;amp;quot;brush:php;toolbar:false;&amp;amp;amp;amp;amp;amp;quot;&amp;amp;amp;amp;amp;gt;not&amp;amp;amp;amp;amp;lt;/pre&amp;amp;amp;amp;amp;gt;&amp;amp;amp;amp;amp;lt;div class=&amp;amp;amp;amp;amp;amp;quot;contentsignin&amp;amp;amp;amp;amp;amp;quot;&amp;amp;amp;amp;amp;gt; &amp;amp;amp;amp;amp;lt;/div&amp;amp;amp;amp;amp;gt;&amp;amp;amp;amp;amp;lt;/div&amp;amp;amp;amp;amp;gt;）、比较运算符（&amp;amp;amp;amp;amp;lt;div class=&amp;amp;amp;amp;amp;amp;quot;code&amp;amp;amp;amp;amp;amp;quot; style=&amp;amp;amp;amp;amp;amp;quot;position:relative; padding:0px; margin:0px;&amp;amp;amp;amp;amp;amp;quot;&amp;amp;amp;amp;amp;gt;&amp;amp;amp;amp;amp;lt;div class=&amp;amp;amp;amp;amp;amp;quot;code&amp;amp;amp;amp;amp;amp;quot; style=&amp;amp;amp;amp;amp;amp;quot;position:relative; padding:0px; margin:0px;&amp;amp;amp;amp;amp;amp;quot;&amp;amp;amp;amp;amp;gt;&amp;amp;amp;amp;amp;lt;pre class=&amp;amp;amp;amp;amp;amp;quot;brush:php;toolbar:false;&amp;amp;amp;amp;amp;amp;quot;&amp;amp;amp;amp;amp;gt;=&amp;amp;amp;amp;amp;lt;/pre&amp;amp;amp;amp;amp;gt;&amp;amp;amp;amp;amp;lt;div class=&amp;amp;amp;amp;amp;amp;quot;contentsignin&amp;amp;amp;amp;amp;amp;quot;&amp;amp;amp;amp;amp;gt; 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&amp;amp;amp;amp;amp;lt;/div&amp;amp;amp;amp;amp;gt;&amp;amp;amp;amp;amp;lt;/div&amp;amp;amp;amp;amp;gt;&amp;amp;amp;amp;amp;lt;div class=&amp;amp;amp;amp;amp;amp;quot;contentsignin&amp;amp;amp;amp;amp;amp;quot;&amp;amp;amp;amp;amp;gt; &amp;amp;amp;amp;amp;lt;/div&amp;amp;amp;amp;amp;gt;&amp;amp;amp;amp;amp;lt;/div&amp;amp;amp;amp;amp;gt;&amp;amp;amp;amp;amp;lt;div class=&amp;amp;amp;amp;amp;amp;quot;contentsignin&amp;amp;amp;amp;amp;amp;quot;&amp;amp;amp;amp;amp;gt; &amp;amp;amp;amp;amp;lt;/div&amp;amp;amp;amp;amp;gt;&amp;amp;amp;amp;amp;lt;/div&amp;amp;amp;amp;amp;gt;，不需要写成&amp;amp;amp;amp;amp;lt;div class=&amp;amp;amp;amp;amp;amp;quot;code&amp;amp;amp;amp;amp;amp;quot; style=&amp;amp;amp;amp;amp;amp;quot;position:relative; padding:0px; margin:0px;&amp;amp;amp;amp;amp;amp;quot;&amp;amp;amp;amp;amp;gt;&amp;amp;amp;amp;amp;lt;pre class=&amp;amp;amp;amp;amp;amp;quot;brush:php;toolbar:false;&amp;amp;amp;amp;amp;amp;quot;&amp;amp;amp;amp;amp;gt;\>&amp;amp;amp;amp;amp;lt;/pre&amp;amp;amp;amp;amp;gt;&amp;amp;amp;amp;amp;lt;div class=&amp;amp;amp;amp;amp;amp;quot;contentsignin&amp;amp;amp;amp;amp;amp;quot;&amp;amp;amp;amp;amp;gt; &amp;amp;amp;amp;amp;lt;/div&amp;amp;amp;amp;amp;gt;&amp;amp;amp;amp;amp;lt;/div&amp;amp;amp;amp;amp;gt;或者别的什么。&amp;amp;amp;amp;amp;lt;/p&amp;amp;amp;amp;amp;gt; &amp;amp;amp;amp;amp;lt;p&amp;amp;amp;amp;amp;gt;真正的“陷阱”或者说需要“变通”的地方，主要集中在两个方面：&amp;amp;amp;amp;amp;lt;/p&amp;amp;amp;amp;amp;gt; &amp;amp;amp;amp;amp;lt;ol&amp;amp;amp;amp;amp;gt; &amp;amp;amp;amp;amp;lt;li&amp;amp;amp;amp;amp;gt; &amp;amp;amp;amp;amp;lt;p&amp;amp;amp;amp;amp;gt;&amp;amp;amp;amp;amp;lt;strong&amp;amp;amp;amp;amp;gt;XPath字符串字面量中的引号处理&amp;amp;amp;amp;amp;lt;/strong&amp;amp;amp;amp;amp;gt;：这是最常见的问题。如果你想在XPath中匹配一个包含引号的字符串，比如&amp;amp;amp;amp;amp;lt;div class=&amp;amp;amp;amp;amp;amp;quot;code&amp;amp;amp;amp;amp;amp;quot; style=&amp;amp;amp;amp;amp;amp;quot;position:relative; padding:0px; margin:0px;&amp;amp;amp;amp;amp;amp;quot;&amp;amp;amp;amp;amp;gt;&amp;amp;amp;amp;amp;lt;pre class=&amp;amp;amp;amp;amp;amp;quot;brush:php;toolbar:false;&amp;amp;amp;amp;amp;amp;quot;&amp;amp;amp;amp;amp;gt;&amp;amp;amp;amp;amp;amp;quot;It's a test&amp;amp;amp;amp;amp;amp;quot;&amp;amp;amp;amp;amp;lt;/pre&amp;amp;amp;amp;amp;gt;&amp;amp;amp;amp;amp;lt;div class=&amp;amp;amp;amp;amp;amp;quot;contentsignin&amp;amp;amp;amp;amp;amp;quot;&amp;amp;amp;amp;amp;gt; &amp;amp;amp;amp;amp;lt;/div&amp;amp;amp;amp;amp;gt;&amp;amp;amp;amp;amp;lt;/div&amp;amp;amp;amp;amp;gt;，你就不能简单地用单引号包围它，因为字符串内部的单引号会提前结束你的字符串。XPath本身没有像大多数编程语言那样的反斜杠转义机制（例如&amp;amp;amp;amp;amp;lt;div class=&amp;amp;amp;amp;amp;amp;quot;code&amp;amp;amp;amp;amp;amp;quot; style=&amp;amp;amp;amp;amp;amp;quot;position:relative; padding:0px; margin:0px;&amp;amp;amp;amp;amp;amp;quot;&amp;amp;amp;amp;amp;gt;&amp;amp;amp;amp;amp;lt;pre class=&amp;amp;amp;amp;amp;amp;quot;brush:php;toolbar:false;&amp;amp;amp;amp;amp;amp;quot;&amp;amp;amp;amp;amp;gt;\'&amp;amp;amp;amp;amp;lt;/pre&amp;amp;amp;amp;amp;gt;&amp;amp;amp;amp;amp;lt;div class=&amp;amp;amp;amp;amp;amp;quot;contentsignin&amp;amp;amp;amp;amp;amp;quot;&amp;amp;amp;amp;amp;gt; &amp;amp;amp;amp;amp;lt;/div&amp;amp;amp;amp;amp;gt;&amp;amp;amp;amp;amp;lt;/div&amp;amp;amp;amp;amp;gt;或&amp;amp;amp;amp;amp;lt;div class=&amp;amp;amp;amp;amp;amp;quot;code&amp;amp;amp;amp;amp;amp;quot; style=&amp;amp;amp;amp;amp;amp;quot;position:relative; padding:0px; 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&amp;amp;amp;amp;amp;lt;/div&amp;amp;amp;amp;amp;gt;&amp;amp;amp;amp;amp;lt;/div&amp;amp;amp;amp;amp;gt;）来包围整个字符串。例如：&amp;amp;amp;amp;amp;lt;div class=&amp;amp;amp;amp;amp;amp;quot;code&amp;amp;amp;amp;amp;amp;quot; style=&amp;amp;amp;amp;amp;amp;quot;position:relative; padding:0px; margin:0px;&amp;amp;amp;amp;amp;amp;quot;&amp;amp;amp;amp;amp;gt;&amp;amp;amp;amp;amp;lt;pre class=&amp;amp;amp;amp;amp;amp;quot;brush:php;toolbar:false;&amp;amp;amp;amp;amp;amp;quot;&amp;amp;amp;amp;amp;gt;//item[text()=&amp;amp;amp;amp;amp;amp;quot;It's a great day&amp;amp;amp;amp;amp;amp;quot;]&amp;amp;amp;amp;amp;lt;/pre&amp;amp;amp;amp;amp;gt;&amp;amp;amp;amp;amp;lt;div class=&amp;amp;amp;amp;amp;amp;quot;contentsignin&amp;amp;amp;amp;amp;amp;quot;&amp;amp;amp;amp;amp;gt; &amp;amp;amp;amp;amp;lt;/div&amp;amp;amp;amp;amp;gt;&amp;amp;amp;amp;amp;lt;/div&amp;amp;amp;amp;amp;gt;。&amp;amp;amp;amp;amp;lt;/li&amp;amp;amp;amp;amp;gt; &amp;amp;amp;amp;amp;lt;li&amp;amp;amp;amp;amp;gt;如果你的字符串内容包含双引号（&amp;amp;amp;amp;amp;lt;div class=&amp;amp;amp;amp;amp;amp;quot;code&amp;amp;amp;amp;amp;amp;quot; 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&amp;amp;amp;amp;amp;lt;/div&amp;amp;amp;amp;amp;gt;&amp;amp;amp;amp;amp;lt;/div&amp;amp;amp;amp;amp;gt;&amp;amp;amp;amp;amp;lt;div class=&amp;amp;amp;amp;amp;amp;quot;contentsignin&amp;amp;amp;amp;amp;amp;quot;&amp;amp;amp;amp;amp;gt; &amp;amp;amp;amp;amp;lt;/div&amp;amp;amp;amp;amp;gt;&amp;amp;amp;amp;amp;lt;/div&amp;amp;amp;amp;amp;gt;&amp;amp;amp;amp;amp;lt;div class=&amp;amp;amp;amp;amp;amp;quot;contentsignin&amp;amp;amp;amp;amp;amp;quot;&amp;amp;amp;amp;amp;gt; &amp;amp;amp;amp;amp;lt;/div&amp;amp;amp;amp;amp;gt;&amp;amp;amp;amp;amp;lt;/div&amp;amp;amp;amp;amp;gt;）来包围整个字符串。例如：&amp;amp;amp;amp;amp;lt;div class=&amp;amp;amp;amp;amp;amp;quot;code&amp;amp;amp;amp;amp;amp;quot; style=&amp;amp;amp;amp;amp;amp;quot;position:relative; padding:0px; margin:0px;&amp;amp;amp;amp;amp;amp;quot;&amp;amp;amp;amp;amp;gt;&amp;amp;amp;amp;amp;lt;pre class=&amp;amp;amp;amp;amp;amp;quot;brush:php;toolbar:false;&amp;amp;amp;amp;amp;amp;quot;&amp;amp;amp;amp;amp;gt;//item[text()='He said &amp;amp;amp;amp;amp;amp;quot;Hello!&amp;amp;amp;amp;amp;amp;quot;']&amp;amp;amp;amp;amp;lt;/pre&amp;amp;amp;amp;amp;gt;&amp;amp;amp;amp;amp;lt;div class=&amp;amp;amp;amp;amp;amp;quot;contentsignin&amp;amp;amp;amp;amp;amp;quot;&amp;amp;amp;amp;amp;gt; &amp;amp;amp;amp;amp;lt;/div&amp;amp;amp;amp;amp;gt;&amp;amp;amp;amp;amp;lt;/div&amp;amp;amp;amp;amp;gt;。&amp;amp;amp;amp;amp;lt;/li&amp;amp;amp;amp;amp;gt; &amp;amp;amp;amp;amp;lt;li&amp;amp;amp;amp;amp;gt;如果你的字符串内容既包含单引号又包含双引号，或者你需要匹配的字符串正好是当前字符串定界符的类型，那就需要使用&amp;amp;amp;amp;amp;lt;div class=&amp;amp;amp;amp;amp;amp;quot;code&amp;amp;amp;amp;amp;amp;quot; style=&amp;amp;amp;amp;amp;amp;quot;position:relative; padding:0px; margin:0px;&amp;amp;amp;amp;amp;amp;quot;&amp;amp;amp;amp;amp;gt;&amp;amp;amp;amp;amp;lt;div class=&amp;amp;amp;amp;amp;amp;quot;code&amp;amp;amp;amp;amp;amp;quot; style=&amp;amp;amp;amp;amp;amp;quot;position:relative; padding:0px; margin:0px;&amp;amp;amp;amp;amp;amp;quot;&amp;amp;amp;amp;amp;gt;&amp;amp;amp;amp;amp;lt;div class=&amp;amp;amp;amp;amp;amp;quot;code&amp;amp;amp;amp;amp;amp;quot; style=&amp;amp;amp;amp;amp;amp;quot;position:relative; padding:0px; margin:0px;&amp;amp;amp;amp;amp;amp;quot;&amp;amp;amp;amp;amp;gt;&amp;amp;amp;amp;amp;lt;div class=&amp;amp;amp;amp;amp;amp;quot;code&amp;amp;amp;amp;amp;amp;quot; 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&amp;amp;amp;amp;amp;lt;/div&amp;amp;amp;amp;amp;gt;&amp;amp;amp;amp;amp;lt;/div&amp;amp;amp;amp;amp;gt;函数来拼接字符串。这是XPath 1.0时代最常用的策略，虽然有点啰嗦，但非常可靠。例如，要匹配字符串&amp;amp;amp;amp;amp;lt;div class=&amp;amp;amp;amp;amp;amp;quot;code&amp;amp;amp;amp;amp;amp;quot; style=&amp;amp;amp;amp;amp;amp;quot;position:relative; padding:0px; margin:0px;&amp;amp;amp;amp;amp;amp;quot;&amp;amp;amp;amp;amp;gt;&amp;amp;amp;amp;amp;lt;pre class=&amp;amp;amp;amp;amp;amp;quot;brush:php;toolbar:false;&amp;amp;amp;amp;amp;amp;quot;&amp;amp;amp;amp;amp;gt;It's &amp;amp;amp;amp;amp;amp;quot;really&amp;amp;amp;amp;amp;amp;quot; good&amp;amp;amp;amp;amp;lt;/pre&amp;amp;amp;amp;amp;gt;&amp;amp;amp;amp;amp;lt;div class=&amp;amp;amp;amp;amp;amp;quot;contentsignin&amp;amp;amp;amp;amp;amp;quot;&amp;amp;amp;amp;amp;gt; &amp;amp;amp;amp;amp;lt;/div&amp;amp;amp;amp;amp;gt;&amp;amp;amp;amp;amp;lt;/div&amp;amp;amp;amp;amp;gt;，你可以这样写：&amp;amp;amp;amp;amp;lt;div class=&amp;amp;amp;amp;amp;amp;quot;code&amp;amp;amp;amp;amp;amp;quot; 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&amp;amp;amp;amp;amp;lt;/div&amp;amp;amp;amp;amp;gt;&amp;amp;amp;amp;amp;lt;/div&amp;amp;amp;amp;amp;gt;。比如，&amp;amp;amp;amp;amp;lt;div class=&amp;amp;amp;amp;amp;amp;quot;code&amp;amp;amp;amp;amp;amp;quot; style=&amp;amp;amp;amp;amp;amp;quot;position:relative; padding:0px; margin:0px;&amp;amp;amp;amp;amp;amp;quot;&amp;amp;amp;amp;amp;gt;&amp;amp;amp;amp;amp;lt;pre class=&amp;amp;amp;amp;amp;amp;quot;brush:php;toolbar:false;&amp;amp;amp;amp;amp;amp;quot;&amp;amp;amp;amp;amp;gt;select=&amp;amp;amp;amp;amp;amp;quot;a[@id < 10]&amp;amp;amp;amp;amp;amp;quot;&amp;amp;amp;amp;amp;lt;/pre&amp;amp;amp;amp;amp;gt;&amp;amp;amp;amp;amp;lt;div class=&amp;amp;amp;amp;amp;amp;quot;contentsignin&amp;amp;amp;amp;amp;amp;quot;&amp;amp;amp;amp;amp;gt; &amp;amp;amp;amp;amp;lt;/div&amp;amp;amp;amp;amp;gt;&amp;amp;amp;amp;amp;lt;/div&amp;amp;amp;amp;amp;gt;在XML属性中就是错误的，必须写成&amp;amp;amp;amp;amp;lt;div class=&amp;amp;amp;amp;amp;amp;quot;code&amp;amp;amp;amp;amp;amp;quot; style=&amp;amp;amp;amp;amp;amp;quot;position:relative; 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&amp;amp;amp;amp;amp;lt;p&amp;amp;amp;amp;amp;gt;处理XPath字符串中的引号，其实就是个“避让”的策略，而不是传统意义上的字符转义。我个人觉得，这地方是很多初学者最容易卡壳的地方，因为大家习惯了编程语言里用反斜杠&amp;amp;amp;amp;amp;lt;div class=&amp;amp;amp;amp;amp;amp;quot;code&amp;amp;amp;amp;amp;amp;quot; style=&amp;amp;amp;amp;amp;amp;quot;position:relative; padding:0px; margin:0px;&amp;amp;amp;amp;amp;amp;quot;&amp;amp;amp;amp;amp;gt;&amp;amp;amp;amp;amp;lt;pre class=&amp;amp;amp;amp;amp;amp;quot;brush:php;toolbar:false;&amp;amp;amp;amp;amp;amp;quot;&amp;amp;amp;amp;amp;gt;\&amp;amp;amp;amp;amp;lt;/pre&amp;amp;amp;amp;amp;gt;&amp;amp;amp;amp;amp;lt;div class=&amp;amp;amp;amp;amp;amp;quot;contentsignin&amp;amp;amp;amp;amp;amp;quot;&amp;amp;amp;amp;amp;gt; &amp;amp;amp;amp;amp;lt;/div&amp;amp;amp;amp;amp;gt;&amp;amp;amp;amp;amp;lt;/div&amp;amp;amp;amp;amp;gt;来转义的模式。但XPath它就是这么设计的，简单粗暴但有效。&amp;amp;amp;amp;amp;lt;/p&amp;amp;amp;amp;amp;gt; &amp;amp;amp;amp;amp;lt;p&amp;amp;amp;amp;amp;gt;当你需要匹配的文本内容本身包含引号时，你得灵活选择用来包围整个字符串的引号类型。 比如，你有一个XML节点，其文本内容是&amp;amp;amp;amp;amp;lt;div class=&amp;amp;amp;amp;amp;amp;quot;code&amp;amp;amp;amp;amp;amp;quot; 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&amp;amp;amp;amp;amp;lt;/div&amp;amp;amp;amp;amp;gt;&amp;amp;amp;amp;amp;lt;/div&amp;amp;amp;amp;amp;gt;。因为第一个单引号后面的&amp;amp;amp;amp;amp;lt;div class=&amp;amp;amp;amp;amp;amp;quot;code&amp;amp;amp;amp;amp;amp;quot; style=&amp;amp;amp;amp;amp;amp;quot;position:relative; padding:0px; margin:0px;&amp;amp;amp;amp;amp;amp;quot;&amp;amp;amp;amp;amp;gt;&amp;amp;amp;amp;amp;lt;div class=&amp;amp;amp;amp;amp;amp;quot;code&amp;amp;amp;amp;amp;amp;quot; style=&amp;amp;amp;amp;amp;amp;quot;position:relative; padding:0px; margin:0px;&amp;amp;amp;amp;amp;amp;quot;&amp;amp;amp;amp;amp;gt;&amp;amp;amp;amp;amp;lt;pre class=&amp;amp;amp;amp;amp;amp;quot;brush:php;toolbar:false;&amp;amp;amp;amp;amp;amp;quot;&amp;amp;amp;amp;amp;gt;s&amp;amp;amp;amp;amp;lt;/pre&amp;amp;amp;amp;amp;gt;&amp;amp;amp;amp;amp;lt;div class=&amp;amp;amp;amp;amp;amp;quot;contentsignin&amp;amp;amp;amp;amp;amp;quot;&amp;amp;amp;amp;amp;gt; &amp;amp;amp;amp;amp;lt;/div&amp;amp;amp;amp;amp;gt;&amp;amp;amp;amp;amp;lt;/div&amp;amp;amp;amp;amp;gt;&amp;amp;amp;amp;amp;lt;div class=&amp;amp;amp;amp;amp;amp;quot;contentsignin&amp;amp;amp;amp;amp;amp;quot;&amp;amp;amp;amp;amp;gt; &amp;amp;amp;amp;amp;lt;/div&amp;amp;amp;amp;amp;gt;&amp;amp;amp;amp;amp;lt;/div&amp;amp;amp;amp;amp;gt;会让XPath认为字符串已经结束了，然后&amp;amp;amp;amp;amp;lt;div class=&amp;amp;amp;amp;amp;amp;quot;code&amp;amp;amp;amp;amp;amp;quot; style=&amp;amp;amp;amp;amp;amp;quot;position:relative; padding:0px; margin:0px;&amp;amp;amp;amp;amp;amp;quot;&amp;amp;amp;amp;amp;gt;&amp;amp;amp;amp;amp;lt;div class=&amp;amp;amp;amp;amp;amp;quot;code&amp;amp;amp;amp;amp;amp;quot; style=&amp;amp;amp;amp;amp;amp;quot;position:relative; padding:0px; margin:0px;&amp;amp;amp;amp;amp;amp;quot;&amp;amp;amp;amp;amp;gt;&amp;amp;amp;amp;amp;lt;pre class=&amp;amp;amp;amp;amp;amp;quot;brush:php;toolbar:false;&amp;amp;amp;amp;amp;amp;quot;&amp;amp;amp;amp;amp;gt;s&amp;amp;amp;amp;amp;lt;/pre&amp;amp;amp;amp;amp;gt;&amp;amp;amp;amp;amp;lt;div class=&amp;amp;amp;amp;amp;amp;quot;contentsignin&amp;amp;amp;amp;amp;amp;quot;&amp;amp;amp;amp;amp;gt; &amp;amp;amp;amp;amp;lt;/div&amp;amp;amp;amp;amp;gt;&amp;amp;amp;amp;amp;lt;/div&amp;amp;amp;amp;amp;gt;&amp;amp;amp;amp;amp;lt;div class=&amp;amp;amp;amp;amp;amp;quot;contentsignin&amp;amp;amp;amp;amp;amp;quot;&amp;amp;amp;amp;amp;gt; &amp;amp;amp;amp;amp;lt;/div&amp;amp;amp;amp;amp;gt;&amp;amp;amp;amp;amp;lt;/div&amp;amp;amp;amp;amp;gt;就成了语法错误。这时候，你得用双引号来包围整个字符串：&amp;amp;amp;amp;amp;lt;div class=&amp;amp;amp;amp;amp;amp;quot;code&amp;amp;amp;amp;amp;amp;quot; style=&amp;amp;amp;amp;amp;amp;quot;position:relative; padding:0px; margin:0px;&amp;amp;amp;amp;amp;amp;quot;&amp;amp;amp;amp;amp;gt;&amp;amp;amp;amp;amp;lt;pre class=&amp;amp;amp;amp;amp;amp;quot;brush:php;toolbar:false;&amp;amp;amp;amp;amp;amp;quot;&amp;amp;amp;amp;amp;gt;//someNode[text()=&amp;amp;amp;amp;amp;amp;quot;It's a beautiful day!&amp;amp;amp;amp;amp;amp;quot;]&amp;amp;amp;amp;amp;lt;/pre&amp;amp;amp;amp;amp;gt;&amp;amp;amp;amp;amp;lt;div class=&amp;amp;amp;amp;amp;amp;quot;contentsignin&amp;amp;amp;amp;amp;amp;quot;&amp;amp;amp;amp;amp;gt; &amp;amp;amp;amp;amp;lt;/div&amp;amp;amp;amp;amp;gt;&amp;amp;amp;amp;amp;lt;/div&amp;amp;amp;amp;amp;gt;。&amp;amp;amp;amp;amp;lt;/p&amp;amp;amp;amp;amp;gt; &amp;amp;amp;amp;amp;lt;p&amp;amp;amp;amp;amp;gt;反过来也一样。如果文本内容是&amp;amp;amp;amp;amp;lt;div class=&amp;amp;amp;amp;amp;amp;quot;code&amp;amp;amp;amp;amp;amp;quot; style=&amp;amp;amp;amp;amp;amp;quot;position:relative; padding:0px; margin:0px;&amp;amp;amp;amp;amp;amp;quot;&amp;amp;amp;amp;amp;gt;&amp;amp;amp;amp;amp;lt;pre class=&amp;amp;amp;amp;amp;amp;quot;brush:php;toolbar:false;&amp;amp;amp;amp;amp;amp;quot;&amp;amp;amp;amp;amp;gt;He said &amp;amp;amp;amp;amp;amp;quot;Hello!&amp;amp;amp;amp;amp;amp;quot;&amp;amp;amp;amp;amp;lt;/pre&amp;amp;amp;amp;amp;gt;&amp;amp;amp;amp;amp;lt;div class=&amp;amp;amp;amp;amp;amp;quot;contentsignin&amp;amp;amp;amp;amp;amp;quot;&amp;amp;amp;amp;amp;gt; &amp;amp;amp;amp;amp;lt;/div&amp;amp;amp;amp;amp;gt;&amp;amp;amp;amp;amp;lt;/div&amp;amp;amp;amp;amp;gt;，你就得用单引号：&amp;amp;amp;amp;amp;lt;div class=&amp;amp;amp;amp;amp;amp;quot;code&amp;amp;amp;amp;amp;amp;quot; style=&amp;amp;amp;amp;amp;amp;quot;position:relative; padding:0px; margin:0px;&amp;amp;amp;amp;amp;amp;quot;&amp;amp;amp;amp;amp;gt;&amp;amp;amp;amp;amp;lt;pre class=&amp;amp;amp;amp;amp;amp;quot;brush:php;toolbar:false;&amp;amp;amp;amp;amp;amp;quot;&amp;amp;amp;amp;amp;gt;//anotherNode[text()='He said &amp;amp;amp;amp;amp;amp;quot;Hello!&amp;amp;amp;amp;amp;amp;quot;']&amp;amp;amp;amp;amp;lt;/pre&amp;amp;amp;amp;amp;gt;&amp;amp;amp;amp;amp;lt;div class=&amp;amp;amp;amp;amp;amp;quot;contentsignin&amp;amp;amp;amp;amp;amp;quot;&amp;amp;amp;amp;amp;gt; 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&amp;amp;amp;amp;amp;lt;/div&amp;amp;amp;amp;amp;gt;&amp;amp;amp;amp;amp;lt;/div&amp;amp;amp;amp;amp;gt;&amp;amp;amp;amp;amp;lt;div class=&amp;amp;amp;amp;amp;amp;quot;contentsignin&amp;amp;amp;amp;amp;amp;quot;&amp;amp;amp;amp;amp;gt; &amp;amp;amp;amp;amp;lt;/div&amp;amp;amp;amp;amp;gt;&amp;amp;amp;amp;amp;lt;/div&amp;amp;amp;amp;amp;gt;&amp;amp;amp;amp;amp;lt;div class=&amp;amp;amp;amp;amp;amp;quot;contentsignin&amp;amp;amp;amp;amp;amp;quot;&amp;amp;amp;amp;amp;gt; &amp;amp;amp;amp;amp;lt;/div&amp;amp;amp;amp;amp;gt;&amp;amp;amp;amp;amp;lt;/div&amp;amp;amp;amp;amp;gt;拼接起来。 例如：&amp;amp;amp;amp;amp;lt;div class=&amp;amp;amp;amp;amp;amp;quot;code&amp;amp;amp;amp;amp;amp;quot; style=&amp;amp;amp;amp;amp;amp;quot;position:relative; padding:0px; margin:0px;&amp;amp;amp;amp;amp;amp;quot;&amp;amp;amp;amp;amp;gt;&amp;amp;amp;amp;amp;lt;pre class=&amp;amp;amp;amp;amp;amp;quot;brush:php;toolbar:false;&amp;amp;amp;amp;amp;amp;quot;&amp;amp;amp;amp;amp;gt;//item[text()=concat('It', &amp;amp;amp;amp;amp;amp;quot;'&amp;amp;amp;amp;amp;amp;quot;, 's &amp;amp;amp;amp;amp;amp;quot;really&amp;amp;amp;amp;amp;amp;quot; good!')]&amp;amp;amp;amp;amp;lt;/pre&amp;amp;amp;amp;amp;gt;&amp;amp;amp;amp;amp;lt;div class=&amp;amp;amp;amp;amp;amp;quot;contentsignin&amp;amp;amp;amp;amp;amp;quot;&amp;amp;amp;amp;amp;gt; &amp;amp;amp;amp;amp;lt;/div&amp;amp;amp;amp;amp;gt;&amp;amp;amp;amp;amp;lt;/div&amp;amp;amp;amp;amp;gt;。这里，&amp;amp;amp;amp;amp;lt;div class=&amp;amp;amp;amp;amp;amp;quot;code&amp;amp;amp;amp;amp;amp;quot; style=&amp;amp;amp;amp;amp;amp;quot;position:relative; padding:0px; margin:0px;&amp;amp;amp;amp;amp;amp;quot;&amp;amp;amp;amp;amp;gt;&amp;amp;amp;amp;amp;lt;div class=&amp;amp;amp;amp;amp;amp;quot;code&amp;amp;amp;amp;amp;amp;quot; style=&amp;amp;amp;amp;amp;amp;quot;position:relative; padding:0px; margin:0px;&amp;amp;amp;amp;amp;amp;quot;&amp;amp;amp;amp;amp;gt;&amp;amp;amp;amp;amp;lt;div class=&amp;amp;amp;amp;amp;amp;quot;code&amp;amp;amp;amp;amp;amp;quot; style=&amp;amp;amp;amp;amp;amp;quot;position:relative; padding:0px; margin:0px;&amp;amp;amp;amp;amp;amp;quot;&amp;amp;amp;amp;amp;gt;&amp;amp;amp;amp;amp;lt;div class=&amp;amp;amp;amp;amp;amp;quot;code&amp;amp;amp;amp;amp;amp;quot; 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style=&amp;amp;amp;amp;amp;amp;quot;position:relative; padding:0px; margin:0px;&amp;amp;amp;amp;amp;amp;quot;&amp;amp;amp;amp;amp;gt;&amp;amp;amp;amp;amp;lt;pre class=&amp;amp;amp;amp;amp;amp;quot;brush:php;toolbar:false;&amp;amp;amp;amp;amp;amp;quot;&amp;amp;amp;amp;amp;gt;'s &amp;amp;amp;amp;amp;amp;quot;really&amp;amp;amp;amp;amp;amp;quot; good!'&amp;amp;amp;amp;amp;lt;/pre&amp;amp;amp;amp;amp;gt;&amp;amp;amp;amp;amp;lt;div class=&amp;amp;amp;amp;amp;amp;quot;contentsignin&amp;amp;amp;amp;amp;amp;quot;&amp;amp;amp;amp;amp;gt; &amp;amp;amp;amp;amp;lt;/div&amp;amp;amp;amp;amp;gt;&amp;amp;amp;amp;amp;lt;/div&amp;amp;amp;amp;amp;gt;是另一个。这样，XPath就能正确解析你的意图了。这种方法虽然看起来有点笨拙，但它在XPath 1.0中是处理复杂字符串字面量的标准且唯一的方式。&amp;amp;amp;amp;amp;lt;/p&amp;amp;amp;amp;amp;gt; &amp;amp;amp;amp;amp;lt;h3&amp;amp;amp;amp;amp;gt;XPath表达式在XML属性中如何书写？&amp;amp;amp;amp;amp;lt;/h3&amp;amp;amp;amp;amp;gt; &amp;amp;amp;amp;amp;lt;p&amp;amp;amp;amp;amp;gt;当我们将XPath表达式嵌入到XML或HTML文档的属性值中时，比如在XSLT的&amp;amp;amp;amp;amp;lt;div class=&amp;amp;amp;amp;amp;amp;quot;code&amp;amp;amp;amp;amp;amp;quot; 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&amp;amp;amp;amp;amp;lt;/div&amp;amp;amp;amp;amp;gt;&amp;amp;amp;amp;amp;lt;/div&amp;amp;amp;amp;amp;gt; 这里，&amp;amp;amp;amp;amp;lt;div class=&amp;amp;amp;amp;amp;amp;quot;code&amp;amp;amp;amp;amp;amp;quot; style=&amp;amp;amp;amp;amp;amp;quot;position:relative; padding:0px; margin:0px;&amp;amp;amp;amp;amp;amp;quot;&amp;amp;amp;amp;amp;gt;&amp;amp;amp;amp;amp;lt;div class=&amp;amp;amp;amp;amp;amp;quot;code&amp;amp;amp;amp;amp;amp;quot; style=&amp;amp;amp;amp;amp;amp;quot;position:relative; padding:0px; margin:0px;&amp;amp;amp;amp;amp;amp;quot;&amp;amp;amp;amp;amp;gt;&amp;amp;amp;amp;amp;lt;div class=&amp;amp;amp;amp;amp;amp;quot;code&amp;amp;amp;amp;amp;amp;quot; style=&amp;amp;amp;amp;amp;amp;quot;position:relative; padding:0px; margin:0px;&amp;amp;amp;amp;amp;amp;quot;&amp;amp;amp;amp;amp;gt;&amp;amp;amp;amp;amp;lt;div class=&amp;amp;amp;amp;amp;amp;quot;code&amp;amp;amp;amp;amp;amp;quot; style=&amp;amp;amp;amp;amp;amp;quot;position:relative; padding:0px; margin:0px;&amp;amp;amp;amp;amp;amp;quot;&amp;amp;amp;amp;amp;gt;&amp;amp;amp;amp;amp;lt;div class=&amp;amp;amp;amp;amp;amp;quot;code&amp;amp;amp;amp;amp;amp;quot; style=&amp;amp;amp;amp;amp;amp;quot;position:relative; padding:0px; margin:0px;&amp;amp;amp;amp;amp;amp;quot;&amp;amp;amp;amp;amp;gt;&amp;amp;amp;amp;amp;lt;div class=&amp;amp;amp;amp;amp;amp;quot;code&amp;amp;amp;amp;amp;amp;quot; style=&amp;amp;amp;amp;amp;amp;quot;position:relative; padding:0px; margin:0px;&amp;amp;amp;amp;amp;amp;quot;&amp;amp;amp;amp;amp;gt;&amp;amp;amp;amp;amp;lt;div class=&amp;amp;amp;amp;amp;amp;quot;code&amp;amp;amp;amp;amp;amp;quot; style=&amp;amp;amp;amp;amp;amp;quot;position:relative; padding:0px; margin:0px;&amp;amp;amp;amp;amp;amp;quot;&amp;amp;amp;amp;amp;gt;&amp;amp;amp;amp;amp;lt;div class=&amp;amp;amp;amp;amp;amp;quot;code&amp;amp;amp;amp;amp;amp;quot; style=&amp;amp;amp;amp;amp;amp;quot;position:relative; padding:0px; margin:0px;&amp;amp;amp;amp;amp;amp;quot;&amp;amp;amp;amp;amp;gt;&amp;amp;amp;amp;amp;lt;div class=&amp;amp;amp;amp;amp;amp;quot;code&amp;amp;amp;amp;amp;amp;quot; style=&amp;amp;amp;amp;amp;amp;quot;position:relative; padding:0px; margin:0px;&amp;amp;amp;amp;amp;amp;quot;&amp;amp;amp;amp;amp;gt;&amp;amp;amp;amp;amp;lt;pre class=&amp;amp;amp;amp;amp;amp;quot;brush:php;toolbar:false;&amp;amp;amp;amp;amp;amp;quot;&amp;amp;amp;amp;amp;gt;>&amp;amp;amp;amp;amp;lt;/pre&amp;amp;amp;amp;amp;gt;&amp;amp;amp;amp;amp;lt;div class=&amp;amp;amp;amp;amp;amp;quot;contentsignin&amp;amp;amp;amp;amp;amp;quot;&amp;amp;amp;amp;amp;gt; &amp;amp;amp;amp;amp;lt;/div&amp;amp;amp;amp;amp;gt;&amp;amp;amp;amp;amp;lt;/div&amp;amp;amp;amp;amp;gt;&amp;amp;amp;amp;amp;lt;div class=&amp;amp;amp;amp;amp;amp;quot;contentsignin&amp;amp;amp;amp;amp;amp;quot;&amp;amp;amp;amp;amp;gt; &amp;amp;amp;amp;amp;lt;/div&amp;amp;amp;amp;amp;gt;&amp;amp;amp;amp;amp;lt;/div&amp;amp;amp;amp;amp;gt;&amp;amp;amp;amp;amp;lt;div class=&amp;amp;amp;amp;amp;amp;quot;contentsignin&amp;amp;amp;amp;amp;amp;quot;&amp;amp;amp;amp;amp;gt; &amp;amp;amp;amp;amp;lt;/div&amp;amp;amp;amp;amp;gt;&amp;amp;amp;amp;amp;lt;/div&amp;amp;amp;amp;amp;gt;&amp;amp;amp;amp;amp;lt;div class=&amp;amp;amp;amp;amp;amp;quot;contentsignin&amp;amp;amp;amp;amp;amp;quot;&amp;amp;amp;amp;amp;gt; &amp;amp;amp;amp;amp;lt;/div&amp;amp;amp;amp;amp;gt;&amp;amp;amp;amp;amp;lt;/div&amp;amp;amp;amp;amp;gt;&amp;amp;amp;amp;amp;lt;div class=&amp;amp;amp;amp;amp;amp;quot;contentsignin&amp;amp;amp;amp;amp;amp;quot;&amp;amp;amp;amp;amp;gt; &amp;amp;amp;amp;amp;lt;/div&amp;amp;amp;amp;amp;gt;&amp;amp;amp;amp;amp;lt;/div&amp;amp;amp;amp;amp;gt;&amp;amp;amp;amp;amp;lt;div class=&amp;amp;amp;amp;amp;amp;quot;contentsignin&amp;amp;amp;amp;amp;amp;quot;&amp;amp;amp;amp;amp;gt; &amp;amp;amp;amp;amp;lt;/div&amp;amp;amp;amp;amp;gt;&amp;amp;amp;amp;amp;lt;/div&amp;amp;amp;amp;amp;gt;&amp;amp;amp;amp;amp;lt;div class=&amp;amp;amp;amp;amp;amp;quot;contentsignin&amp;amp;amp;amp;amp;amp;quot;&amp;amp;amp;amp;amp;gt; &amp;amp;amp;amp;amp;lt;/div&amp;amp;amp;amp;amp;gt;&amp;amp;amp;amp;amp;lt;/div&amp;amp;amp;amp;amp;gt;&amp;amp;amp;amp;amp;lt;div class=&amp;amp;amp;amp;amp;amp;quot;contentsignin&amp;amp;amp;amp;amp;amp;quot;&amp;amp;amp;amp;amp;gt; &amp;amp;amp;amp;amp;lt;/div&amp;amp;amp;amp;amp;gt;&amp;amp;amp;amp;amp;lt;/div&amp;amp;amp;amp;amp;gt;&amp;amp;amp;amp;amp;lt;div class=&amp;amp;amp;amp;amp;amp;quot;contentsignin&amp;amp;amp;amp;amp;amp;quot;&amp;amp;amp;amp;amp;gt; &amp;amp;amp;amp;amp;lt;/div&amp;amp;amp;amp;amp;gt;&amp;amp;amp;amp;amp;lt;/div&amp;amp;amp;amp;amp;gt;被转义了，而&amp;amp;amp;amp;amp;lt;div class=&amp;amp;amp;amp;amp;amp;quot;code&amp;amp;amp;amp;amp;amp;quot; style=&amp;amp;amp;amp;amp;amp;quot;position:relative; padding:0px; margin:0px;&amp;amp;amp;amp;amp;amp;quot;&amp;amp;amp;amp;amp;gt;&amp;amp;amp;amp;amp;lt;pre class=&amp;amp;amp;amp;amp;amp;quot;brush:php;toolbar:false;&amp;amp;amp;amp;amp;amp;quot;&amp;amp;amp;amp;amp;gt;@category='electronics'&amp;amp;amp;amp;amp;lt;/pre&amp;amp;amp;amp;amp;gt;&amp;amp;amp;amp;amp;lt;div class=&amp;amp;amp;amp;amp;amp;quot;contentsignin&amp;amp;amp;amp;amp;amp;quot;&amp;amp;amp;amp;amp;gt; &amp;amp;amp;amp;amp;lt;/div&amp;amp;amp;amp;amp;gt;&amp;amp;amp;amp;amp;lt;/div&amp;amp;amp;amp;amp;gt;中的单引号因为属性值是双引号包围的，所以不需要额外转义。但如果你的XPath字符串内部需要双引号，并且你的XML属性也是用双引号包围的，那么内部的双引号就得用&amp;amp;amp;amp;amp;lt;div class=&amp;amp;amp;amp;amp;amp;quot;code&amp;amp;amp;amp;amp;amp;quot; style=&amp;amp;amp;amp;amp;amp;quot;position:relative; padding:0px; margin:0px;&amp;amp;amp;amp;amp;amp;quot;&amp;amp;amp;amp;amp;gt;&amp;amp;amp;amp;amp;lt;div class=&amp;amp;amp;amp;amp;amp;quot;code&amp;amp;amp;amp;amp;amp;quot; style=&amp;amp;amp;amp;amp;amp;quot;position:relative; padding:0px; margin:0px;&amp;amp;amp;amp;amp;amp;quot;&amp;amp;amp;amp;amp;gt;&amp;amp;amp;amp;amp;lt;div class=&amp;amp;amp;amp;amp;amp;quot;code&amp;amp;amp;amp;amp;amp;quot; style=&amp;amp;amp;amp;amp;amp;quot;position:relative; padding:0px; margin:0px;&amp;amp;amp;amp;amp;amp;quot;&amp;amp;amp;amp;amp;gt;&amp;amp;amp;amp;amp;lt;div class=&amp;amp;amp;amp;amp;amp;quot;code&amp;amp;amp;amp;amp;amp;quot; style=&amp;amp;amp;amp;amp;amp;quot;position:relative; padding:0px; margin:0px;&amp;amp;amp;amp;amp;amp;quot;&amp;amp;amp;amp;amp;gt;&amp;amp;amp;amp;amp;lt;div class=&amp;amp;amp;amp;amp;amp;quot;code&amp;amp;amp;amp;amp;amp;quot; style=&amp;amp;amp;amp;amp;amp;quot;position:relative; padding:0px; margin:0px;&amp;amp;amp;amp;amp;amp;quot;&amp;amp;amp;amp;amp;gt;&amp;amp;amp;amp;amp;lt;div class=&amp;amp;amp;amp;amp;amp;quot;code&amp;amp;amp;amp;amp;amp;quot; style=&amp;amp;amp;amp;amp;amp;quot;position:relative; padding:0px; margin:0px;&amp;amp;amp;amp;amp;amp;quot;&amp;amp;amp;amp;amp;gt;&amp;amp;amp;amp;amp;lt;div class=&amp;amp;amp;amp;amp;amp;quot;code&amp;amp;amp;amp;amp;amp;quot; style=&amp;amp;amp;amp;amp;amp;quot;position:relative; padding:0px; margin:0px;&amp;amp;amp;amp;amp;amp;quot;&amp;amp;amp;amp;amp;gt;&amp;amp;amp;amp;amp;lt;pre class=&amp;amp;amp;amp;amp;amp;quot;brush:php;toolbar:false;&amp;amp;amp;amp;amp;amp;quot;&amp;amp;amp;amp;amp;gt;&amp;amp;amp;amp;amp;amp;quot;&amp;amp;amp;amp;amp;lt;/pre&amp;amp;amp;amp;amp;gt;&amp;amp;amp;amp;amp;lt;div class=&amp;amp;amp;amp;amp;amp;quot;contentsignin&amp;amp;amp;amp;amp;amp;quot;&amp;amp;amp;amp;amp;gt; &amp;amp;amp;amp;amp;lt;/div&amp;amp;amp;amp;amp;gt;&amp;amp;amp;amp;amp;lt;/div&amp;amp;amp;amp;amp;gt;&amp;amp;amp;amp;amp;lt;div class=&amp;amp;amp;amp;amp;amp;quot;contentsignin&amp;amp;amp;amp;amp;amp;quot;&amp;amp;amp;amp;amp;gt; &amp;amp;amp;amp;amp;lt;/div&amp;amp;amp;amp;amp;gt;&amp;amp;amp;amp;amp;lt;/div&amp;amp;amp;amp;amp;gt;&amp;amp;amp;amp;amp;lt;div class=&amp;amp;amp;amp;amp;amp;quot;contentsignin&amp;amp;amp;amp;amp;amp;quot;&amp;amp;amp;amp;amp;gt; &amp;amp;amp;amp;amp;lt;/div&amp;amp;amp;amp;amp;gt;&amp;amp;amp;amp;amp;lt;/div&amp;amp;amp;amp;amp;gt;&amp;amp;amp;amp;amp;lt;div class=&amp;amp;amp;amp;amp;amp;quot;contentsignin&amp;amp;amp;amp;amp;amp;quot;&amp;amp;amp;amp;amp;gt; &amp;amp;amp;amp;amp;lt;/div&amp;amp;amp;amp;amp;gt;&amp;amp;amp;amp;amp;lt;/div&amp;amp;amp;amp;amp;gt;&amp;amp;amp;amp;amp;lt;div class=&amp;amp;amp;amp;amp;amp;quot;contentsignin&amp;amp;amp;amp;amp;amp;quot;&amp;amp;amp;amp;amp;gt; &amp;amp;amp;amp;amp;lt;/div&amp;amp;amp;amp;amp;gt;&amp;amp;amp;amp;amp;lt;/div&amp;amp;amp;amp;amp;gt;&amp;amp;amp;amp;amp;lt;div class=&amp;amp;amp;amp;amp;amp;quot;contentsignin&amp;amp;amp;amp;amp;amp;quot;&amp;amp;amp;amp;amp;gt; &amp;amp;amp;amp;amp;lt;/div&amp;amp;amp;amp;amp;gt;&amp;amp;amp;amp;amp;lt;/div&amp;amp;amp;amp;amp;gt;&amp;amp;amp;amp;amp;lt;div class=&amp;amp;amp;amp;amp;amp;quot;contentsignin&amp;amp;amp;amp;amp;amp;quot;&amp;amp;amp;amp;amp;gt; &amp;amp;amp;amp;amp;lt;/div&amp;amp;amp;amp;amp;gt;&amp;amp;amp;amp;amp;lt;/div&amp;amp;amp;amp;amp;gt;来表示。例如： &amp;amp;amp;amp;amp;lt;div class=&amp;amp;amp;amp;amp;amp;quot;code&amp;amp;amp;amp;amp;amp;quot; style=&amp;amp;amp;amp;amp;amp;quot;position:relative; padding:0px; margin:0px;&amp;amp;amp;amp;amp;amp;quot;&amp;amp;amp;amp;amp;gt;&amp;amp;amp;amp;amp;lt;pre class=&amp;amp;amp;amp;amp;amp;quot;brush:php;toolbar:false;&amp;amp;amp;amp;amp;amp;quot;&amp;amp;amp;amp;amp;gt;select='items/item[@description=&amp;amp;amp;amp;amp;amp;quot;He said &amp;amp;amp;amp;amp;amp;quot;Hello&amp;amp;amp;amp;amp;amp;quot;&amp;amp;amp;amp;amp;amp;quot;]'&amp;amp;amp;amp;amp;lt;/pre&amp;amp;amp;amp;amp;gt;&amp;amp;amp;amp;amp;lt;div class=&amp;amp;amp;amp;amp;amp;quot;contentsignin&amp;amp;amp;amp;amp;amp;quot;&amp;amp;amp;amp;amp;gt; &amp;amp;amp;amp;amp;lt;/div&amp;amp;amp;amp;amp;gt;&amp;amp;amp;amp;amp;lt;/div&amp;amp;amp;amp;amp;gt; （注意这里XML属性本身用单引号包围，所以XPath字符串内部的双引号需要转义）。&amp;amp;amp;amp;amp;lt;/p&amp;amp;amp;amp;amp;gt; &amp;amp;amp;amp;amp;lt;p&amp;amp;amp;amp;amp;gt;总而言之，记住一点：当XPath表达式成为XML属性值的一部分时，它首先是一个XML属性值，然后才是一个XPath表达式。所以，XML的语法规则优先级更高。&amp;amp;amp;amp;amp;lt;/p&amp;amp;amp;amp;amp;gt; &amp;amp;amp;amp;amp;lt;h3&amp;amp;amp;amp;amp;gt;XPath运算符的优先级与括号使用&amp;amp;amp;amp;amp;lt;/h3&amp;amp;amp;amp;amp;gt; &amp;amp;amp;amp;amp;lt;p&amp;amp;amp;amp;amp;gt;XPath中的运算符，就像大多数编程语言一样，有它们固定的优先级规则。理解这些优先级对于编写复杂且行为正确的XPath表达式至关重要，否则你可能会得到意想不到的结果。这不是“转义”的问题，而是确保表达式按照你的意图被计算的问题。&amp;amp;amp;amp;amp;lt;/p&amp;amp;amp;amp;amp;gt; &amp;amp;amp;amp;amp;lt;p&amp;amp;amp;amp;amp;gt;比如，数学运算符的优先级通常是乘除高于加减。在XPath中也是如此。 &amp;amp;amp;amp;amp;lt;div class=&amp;amp;amp;amp;amp;amp;quot;code&amp;amp;amp;amp;amp;amp;quot; style=&amp;amp;amp;amp;amp;amp;quot;position:relative; padding:0px; margin:0px;&amp;amp;amp;amp;amp;amp;quot;&amp;amp;amp;amp;amp;gt;&amp;amp;amp;amp;amp;lt;pre class=&amp;amp;amp;amp;amp;amp;quot;brush:php;toolbar:false;&amp;amp;amp;amp;amp;amp;quot;&amp;amp;amp;amp;amp;gt;1 + 2 * 3&amp;amp;amp;amp;amp;lt;/pre&amp;amp;amp;amp;amp;gt;&amp;amp;amp;amp;amp;lt;div class=&amp;amp;amp;amp;amp;amp;quot;contentsignin&amp;amp;amp;amp;amp;amp;quot;&amp;amp;amp;amp;amp;gt; &amp;amp;amp;amp;amp;lt;/div&amp;amp;amp;amp;amp;gt;&amp;amp;amp;amp;amp;lt;/div&amp;amp;amp;amp;amp;gt; 结果是 &amp;amp;amp;amp;amp;lt;div class=&amp;amp;amp;amp;amp;amp;quot;code&amp;amp;amp;amp;amp;amp;quot; style=&amp;amp;amp;amp;amp;amp;quot;position:relative; padding:0px; margin:0px;&amp;amp;amp;amp;amp;amp;quot;&amp;amp;amp;amp;amp;gt;&amp;amp;amp;amp;amp;lt;pre class=&amp;amp;amp;amp;amp;amp;quot;brush:php;toolbar:false;&amp;amp;amp;amp;amp;amp;quot;&amp;amp;amp;amp;amp;gt;7&amp;amp;amp;amp;amp;lt;/pre&amp;amp;amp;amp;amp;gt;&amp;amp;amp;amp;amp;lt;div class=&amp;amp;amp;amp;amp;amp;quot;contentsignin&amp;amp;amp;amp;amp;amp;quot;&amp;amp;amp;amp;amp;gt; &amp;amp;amp;amp;amp;lt;/div&amp;amp;amp;amp;amp;gt;&amp;amp;amp;amp;amp;lt;/div&amp;amp;amp;amp;amp;gt; (先算 &amp;amp;amp;amp;amp;lt;div class=&amp;amp;amp;amp;amp;amp;quot;code&amp;amp;amp;amp;amp;amp;quot; style=&amp;amp;amp;amp;amp;amp;quot;position:relative; padding:0px; margin:0px;&amp;amp;amp;amp;amp;amp;quot;&amp;amp;amp;amp;amp;gt;&amp;amp;amp;amp;amp;lt;pre class=&amp;amp;amp;amp;amp;amp;quot;brush:php;toolbar:false;&amp;amp;amp;amp;amp;amp;quot;&amp;amp;amp;amp;amp;gt;2 * 3 = 6&amp;amp;amp;amp;amp;lt;/pre&amp;amp;amp;amp;amp;gt;&amp;amp;amp;amp;amp;lt;div class=&amp;amp;amp;amp;amp;amp;quot;contentsignin&amp;amp;amp;amp;amp;amp;quot;&amp;amp;amp;amp;amp;gt; &amp;amp;amp;amp;amp;lt;/div&amp;amp;amp;amp;amp;gt;&amp;amp;amp;amp;amp;lt;/div&amp;amp;amp;amp;amp;gt;，再加 &amp;amp;amp;amp;amp;lt;div class=&amp;amp;amp;amp;amp;amp;quot;code&amp;amp;amp;amp;amp;amp;quot; style=&amp;amp;amp;amp;amp;amp;quot;position:relative; padding:0px; margin:0px;&amp;amp;amp;amp;amp;amp;quot;&amp;amp;amp;amp;amp;gt;&amp;amp;amp;amp;amp;lt;pre class=&amp;amp;amp;amp;amp;amp;quot;brush:php;toolbar:false;&amp;amp;amp;amp;amp;amp;quot;&amp;amp;amp;amp;amp;gt;1&amp;amp;amp;amp;amp;lt;/pre&amp;amp;amp;amp;amp;gt;&amp;amp;amp;amp;amp;lt;div class=&amp;amp;amp;amp;amp;amp;quot;contentsignin&amp;amp;amp;amp;amp;amp;quot;&amp;amp;amp;amp;amp;gt; &amp;amp;amp;amp;amp;lt;/div&amp;amp;amp;amp;amp;gt;&amp;amp;amp;amp;amp;lt;/div&amp;amp;amp;amp;amp;gt;) 如果你想要先执行加法，再执行乘法，就必须使用括号&amp;amp;amp;amp;amp;lt;div class=&amp;amp;amp;amp;amp;amp;quot;code&amp;amp;amp;amp;amp;amp;quot; style=&amp;amp;amp;amp;amp;amp;quot;position:relative; padding:0px; margin:0px;&amp;amp;amp;amp;amp;amp;quot;&amp;amp;amp;amp;amp;gt;&amp;amp;amp;amp;amp;lt;pre class=&amp;amp;amp;amp;amp;amp;quot;brush:php;toolbar:false;&amp;amp;amp;amp;amp;amp;quot;&amp;amp;amp;amp;amp;gt;()&amp;amp;amp;amp;amp;lt;/pre&amp;amp;amp;amp;amp;gt;&amp;amp;amp;amp;amp;lt;div class=&amp;amp;amp;amp;amp;amp;quot;contentsignin&amp;amp;amp;amp;amp;amp;quot;&amp;amp;amp;amp;amp;gt; &amp;amp;amp;amp;amp;lt;/div&amp;amp;amp;amp;amp;gt;&amp;amp;amp;amp;amp;lt;/div&amp;amp;amp;amp;amp;gt;来明确指定运算顺序。 &amp;amp;amp;amp;amp;lt;div class=&amp;amp;amp;amp;amp;amp;quot;code&amp;amp;amp;amp;amp;amp;quot; style=&amp;amp;amp;amp;amp;amp;quot;position:relative; padding:0px; margin:0px;&amp;amp;amp;amp;amp;amp;quot;&amp;amp;amp;amp;amp;gt;&amp;amp;amp;amp;amp;lt;pre class=&amp;amp;amp;amp;amp;amp;quot;brush:php;toolbar:false;&amp;amp;amp;amp;amp;amp;quot;&amp;amp;amp;amp;amp;gt;(1 + 2) * 3&amp;amp;amp;amp;amp;lt;/pre&amp;amp;amp;amp;amp;gt;&amp;amp;amp;amp;amp;lt;div class=&amp;amp;amp;amp;amp;amp;quot;contentsignin&amp;amp;amp;amp;amp;amp;quot;&amp;amp;amp;amp;amp;gt; &amp;amp;amp;amp;amp;lt;/div&amp;amp;amp;amp;amp;gt;&amp;amp;amp;amp;amp;lt;/div&amp;amp;amp;amp;amp;gt; 结果是 &amp;amp;amp;amp;amp;lt;div class=&amp;amp;amp;amp;amp;amp;quot;code&amp;amp;amp;amp;amp;amp;quot; style=&amp;amp;amp;amp;amp;amp;quot;position:relative; padding:0px; margin:0px;&amp;amp;amp;amp;amp;amp;quot;&amp;amp;amp;amp;amp;gt;&amp;amp;amp;amp;amp;lt;pre class=&amp;amp;amp;amp;amp;amp;quot;brush:php;toolbar:false;&amp;amp;amp;amp;amp;amp;quot;&amp;amp;amp;amp;amp;gt;9&amp;amp;amp;amp;amp;lt;/pre&amp;amp;amp;amp;amp;gt;&amp;amp;amp;amp;amp;lt;div class=&amp;amp;amp;amp;amp;amp;quot;contentsignin&amp;amp;amp;amp;amp;amp;quot;&amp;amp;amp;amp;amp;gt; 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style=&amp;amp;amp;amp;amp;amp;quot;position:relative; padding:0px; margin:0px;&amp;amp;amp;amp;amp;amp;quot;&amp;amp;amp;amp;amp;gt;&amp;amp;amp;amp;amp;lt;pre class=&amp;amp;amp;amp;amp;amp;quot;brush:php;toolbar:false;&amp;amp;amp;amp;amp;amp;quot;&amp;amp;amp;amp;amp;gt;stock < 10&amp;amp;amp;amp;amp;lt;/pre&amp;amp;amp;amp;amp;gt;&amp;amp;amp;amp;amp;lt;div class=&amp;amp;amp;amp;amp;amp;quot;contentsignin&amp;amp;amp;amp;amp;amp;quot;&amp;amp;amp;amp;amp;gt; &amp;amp;amp;amp;amp;lt;/div&amp;amp;amp;amp;amp;gt;&amp;amp;amp;amp;amp;lt;/div&amp;amp;amp;amp;amp;gt;&amp;amp;amp;amp;amp;lt;div class=&amp;amp;amp;amp;amp;amp;quot;contentsignin&amp;amp;amp;amp;amp;amp;quot;&amp;amp;amp;amp;amp;gt; &amp;amp;amp;amp;amp;lt;/div&amp;amp;amp;amp;amp;gt;&amp;amp;amp;amp;amp;lt;/div&amp;amp;amp;amp;amp;gt;，这个&amp;amp;amp;amp;amp;lt;div class=&amp;amp;amp;amp;amp;amp;quot;code&amp;amp;amp;amp;amp;amp;quot; style=&amp;amp;amp;amp;amp;amp;quot;position:relative; padding:0px; margin:0px;&amp;amp;amp;amp;amp;amp;quot;&amp;amp;amp;amp;amp;gt;&amp;amp;amp;amp;amp;lt;pre class=&amp;amp;amp;amp;amp;amp;quot;brush:php;toolbar:false;&amp;amp;amp;amp;amp;amp;quot;&amp;amp;amp;amp;amp;gt;item&amp;amp;amp;amp;amp;lt;/pre&amp;amp;amp;amp;amp;gt;&amp;amp;amp;amp;amp;lt;div class=&amp;amp;amp;amp;amp;amp;quot;contentsignin&amp;amp;amp;amp;amp;amp;quot;&amp;amp;amp;amp;amp;gt; &amp;amp;amp;amp;amp;lt;/div&amp;amp;amp;amp;amp;gt;&amp;amp;amp;amp;amp;lt;/div&amp;amp;amp;amp;amp;gt;也会被选中。&amp;amp;amp;amp;amp;lt;/p&amp;amp;amp;amp;amp;gt; &amp;amp;amp;amp;amp;lt;p&amp;amp;amp;amp;amp;gt;如果你希望的是： &amp;amp;amp;amp;amp;lt;div class=&amp;amp;amp;amp;amp;amp;quot;code&amp;amp;amp;amp;amp;amp;quot; style=&amp;amp;amp;amp;amp;amp;quot;position:relative; padding:0px; margin:0px;&amp;amp;amp;amp;amp;amp;quot;&amp;amp;amp;amp;amp;gt;&amp;amp;amp;amp;amp;lt;pre class=&amp;amp;amp;amp;amp;amp;quot;brush:php;toolbar:false;&amp;amp;amp;amp;amp;amp;quot;&amp;amp;amp;amp;amp;gt;//item[category='book' and (price > 50 or stock < 10)]&amp;amp;amp;amp;amp;lt;/pre&amp;amp;amp;amp;amp;gt;&amp;amp;amp;amp;amp;lt;div class=&amp;amp;amp;amp;amp;amp;quot;contentsignin&amp;amp;amp;amp;amp;amp;quot;&amp;amp;amp;amp;amp;gt; &amp;amp;amp;amp;amp;lt;/div&amp;amp;amp;amp;amp;gt;&amp;amp;amp;amp;amp;lt;/div&amp;amp;amp;amp;amp;gt; 也就是，必须是&amp;amp;amp;amp;amp;lt;div class=&amp;amp;amp;amp;amp;amp;quot;code&amp;amp;amp;amp;amp;amp;quot; style=&amp;amp;amp;amp;amp;amp;quot;position:relative; padding:0px; margin:0px;&amp;amp;amp;amp;amp;amp;quot;&amp;amp;amp;amp;amp;gt;&amp;amp;amp;amp;amp;lt;div class=&amp;amp;amp;amp;amp;amp;quot;code&amp;amp;amp;amp;amp;amp;quot; style=&amp;amp;amp;amp;amp;amp;quot;position:relative; padding:0px; margin:0px;&amp;amp;amp;amp;amp;amp;quot;&amp;amp;amp;amp;amp;gt;&amp;amp;amp;amp;amp;lt;pre class=&amp;amp;amp;amp;amp;amp;quot;brush:php;toolbar:false;&amp;amp;amp;amp;amp;amp;quot;&amp;amp;amp;amp;amp;gt;book&amp;amp;amp;amp;amp;lt;/pre&amp;amp;amp;amp;amp;gt;&amp;amp;amp;amp;amp;lt;div class=&amp;amp;amp;amp;amp;amp;quot;contentsignin&amp;amp;amp;amp;amp;amp;quot;&amp;amp;amp;amp;amp;gt; &amp;amp;amp;amp;amp;lt;/div&amp;amp;amp;amp;amp;gt;&amp;amp;amp;amp;amp;lt;/div&amp;amp;amp;amp;amp;gt;&amp;amp;amp;amp;amp;lt;div class=&amp;amp;amp;amp;amp;amp;quot;contentsignin&amp;amp;amp;amp;amp;amp;quot;&amp;amp;amp;amp;amp;gt; &amp;amp;amp;amp;amp;lt;/div&amp;amp;amp;amp;amp;gt;&amp;amp;amp;amp;amp;lt;/div&amp;amp;amp;amp;amp;gt;类别，并且满足价格大于50 &amp;amp;amp;amp;amp;lt;em&amp;amp;amp;amp;amp;gt;或者&amp;amp;amp;amp;amp;lt;/em&amp;amp;amp;amp;amp;gt; 库存小于10这两个条件中的一个。这时候，括号就是不可或缺的，它能强制XPath按照你期望的逻辑顺序进行计算。&amp;amp;amp;amp;amp;lt;/p&amp;amp;amp;amp;amp;gt; &amp;amp;amp;amp;amp;lt;p&amp;amp;amp;amp;amp;gt;所以，当你的XPath表达式变得复杂，涉及到多个运算符和条件时，不要吝啬使用括号。括号不仅能确保表达式的正确性，也能大大提高表达式的可读性，让其他人（包括未来的你自己）更容易理解你的意图。这是一种良好的编程习惯，在XPath中同样适用。&amp;amp;amp;amp;amp;lt;/p&amp;amp;amp;amp;amp;gt;

以上就是XPath的<和>运算符需要转义吗？的详细内容，更多请关注知识资源分享宝库其它相关文章！