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HomeWeb Front-endFront-end Q&AA brief analysis of commonly used character escaping methods in JavaScript and HTML

<p>在 HTML 中,有一些字符具有特殊含义。例如,小于号()被用于标签的开头和结尾。如果要在 HTML 文档中使用这些字符,我们需要对它们进行转义。 在 JavaScript 中,一些特殊字符也需要进行转义,在字符串中使用。本文将介绍 JavaScript 和 HTML 中常用的字符转义方法。</p> <p>HTML 转义字符</p> <p>在 HTML 中,转义字符可以使用特殊字符实体来表示,这些实体使用实体名称或实体编号来表示。以下是 HTML 中常用的一些字符实体名称和实体编号:</p> <table> <thead><tr class="firstRow"> <th>实体名称</th> <th>实体编号</th> <th>符号</th> </tr></thead> <tbody> <tr> <td>小于号</td> <td><code><</code></td><td><</td></tr><tr><td>大于号</td><td><code>></code></td> <td>></td> </tr> <tr> <td>和号</td> <td><code>&</code></td> <td>&</td> </tr> <tr> <td>双引号</td> <td><code>"</code></td> <td>"</td> </tr> <tr> <td>单引号</td> <td><code>'</code></td> <td>'</td> </tr> </tbody> </table> <p>这些实体可以在标签内或标签外使用,例如:</p> <pre class="brush:php;toolbar:false"><p>AT&T 是一家知名的通信公司。</p></pre> <p>上例中,& 实体被用来表示 & 字符,以免其被解释成标签的开头。同样的适用于双引号和单引号。</p> <p>JavaScript 转义字符</p> <p>在 JavaScript 中,如果我们想在一个字符串中使用特殊字符,比如引号,我们需要使用转义字符。以下是一些常见的 JavaScript 转义字符:</p> <table> <thead><tr class="firstRow"> <th>转义字符</th> <th>描述</th> </tr></thead> <tbody> <tr> <td><code>\'</code></td> <td>单引号</td> </tr> <tr> <td><code>\"</code></td> <td>双引号</td> </tr> <tr> <td><code>\\</code></td> <td>反斜线</td> </tr> <tr> <td><code>\n</code></td> <td>换行符</td> </tr> <tr> <td><code>\t</code></td> <td>制表符</td> </tr> </tbody> </table> <p>这些转义字符都是以反斜线开头的,例如:</p> <pre class="brush:php;toolbar:false">var str = 'He said, \"I\'m hungry.\"';</pre> <p>上述代码中,我们使用了 <code>\"</code> 表示引号,而使用了 <code>\'</code> 表示单引号。</p> <p>总结</p> <p>HTML 和 JavaScript 都有转义字符的概念。在 HTML 中,我们需要将一些特殊字符使用实体名称或编号进行转义,以防止其被错误解释为标签。在 JavaScript 中,我们需要使用转义字符来表示特殊字符,以便在字符串中使用。对于 JavaScript 中的转义字符,我们需要注意,如果我们不使用这些特殊字符,可以避免使用转义字符,以增强代码的可读性。</p>

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