html
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“<”和“>”符号，我们可以使用转义字符"<"和">"，分别对应“<”和“>”。
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：
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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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