HTML中的特殊字符，如“”、“&”等，会被浏览器解释为HTML代码，因此无法在HTML文档中直接使用。为了解决这个问题，HTML中引入了转义字符，也就是将特殊字符转换为一些特殊序列，这样就可以在HTML中直接使用这些字符了。本文将介绍HTML中常见的转义字符及其使用方法。
一、HTML转义字符的基本语法
HTML转义字符使用“&”符号开头，以分号“;”结尾。转义序列由一组特殊字符组成，它们代表着一个人工定义的字符或符号。例如，“<”就表示小于号“
二、HTML转义字符的常见用法
1、转义小于号和大于号
如果我们想在HTML中显示“”符号，我们可以使用转义字符"<"和">"，分别对应“”。
2、转义单引号和双引号
在HTML中，单引号和双引号用于表示字符串，如果直接使用会被解析器错误识别。因此，我们需要将其转义为"&apos"和"""，分别对应单引号和双引号。
3、转义符号
在HTML文档中，还有一些特殊符号需要使用特殊的转义序列才能正常呈现。这些符号包括非断行空格“ ”，版权符号“©”，注册商标符号“®”，无角度符号“°”等。
三、示例程序
下面是一个示例程序，演示了HTML中一些常用的转义字符使用方法：
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>HTML转义字符的使用</title>
</head>
<body>
<p>在HTML中，小于号和大于号需要转义，分别使用"<"和">"，例如：</p>
<p><html></p>
<p>在HTML中，单引号和双引号也需要转义，分别使用"&apos"和"""，例如：</p>
<p><input type='text' name="password" value="123456"></p>
<p>在HTML中，非断行空格需要使用" "转义，例如：</p>
<p>3 m</p>
<p>在HTML中，版权符号需要使用"©"转义，例如：</p>
<p>© 2021</p>
<p>在HTML中，注册商标符号需要使用"®"转义，例如：</p>
<p>Superman® is a fictional superhero.</p>
<p>在HTML中，无角度符号需要使用"°"转义，例如：</p>
<p>30°C</p>
</body>
</html>四、注意事项
在使用HTML转义字符时，需要注意以下几点：
1、符号“&”必须在HTML中使用转义字符来表示。
2、在使用转义字符时，一定要把它们拼写正确，否则会被解析器认为是普通文本。
3、由于不同的浏览器解释特殊符号的方式可能会有所不同，因此在编写HTML代码时务必谨慎，以免出现不必要的错误。
结论：
HTML转义字符是HTML语言中的重要组成部分，可以帮助开发者轻松输出HTML中的特殊符号。开发者们在编写HTML代码时应该对常用的转义字符及其用法有所了解，并注意在代码中正确使用转义字符，避免出现意外的错误。
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