Home Web Front-end Front-end Q&A A brief analysis of commonly used character escaping methods in JavaScript and HTML

A brief analysis of commonly used character escaping methods in JavaScript and HTML

Apr 24, 2023 am 09:11 AM

在 HTML 中,有一些字符具有特殊含义。例如,小于号(<)和大于号(>)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。

HTML 转义字符

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:

实体名称 实体编号 符号
小于号 &amp;lt; <
大于号&amp;gt;>
和号 &amp; &
双引号 &quot; "
单引号 &apos; '

这些实体可以在标签内或标签外使用,例如:

&amp;lt;p&amp;gt;AT&amp;amp;T 是一家知名的通信公司。&amp;lt;/p&amp;gt;
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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。

JavaScript 转义字符

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:

转义字符 描述
\' 单引号
\" 双引号
\\ 反斜线
\n 换行符
\t 制表符

这些转义字符都是以反斜线开头的,例如:

var str = 'He said, \&quot;I\'m hungry.\&quot;';
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上述代码中,我们使用了 \" 表示引号,而使用了 \' 表示单引号。

总结

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。

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