在html中，id是“Identity document”的缩写，是“身份标识号”的意思，该属性用于规定元素的唯一id，该属性可用作链接锚，通过JavaScript或通过CSS为带有指定id的元素改变或添加样式。
本教程操作环境：windows10系统、HTML5版、Dell G3电脑。
html中id是什么意思
id 属性规定 HTML 元素的唯一的 id。
id 在 HTML 文档中必须是唯一的。
立即学习“前端免费学习笔记（深入）”；
id 属性可用作链接锚（link anchor），通过 JavaScript（HTML DOM）或通过 CSS 为带有指定 id 的元素改变或添加样式。
HTML 4.01 与 HTML5之间的差异
在 HTML5 中, id 属性可用于任何的 HTML 元素 (它会验证任何HTML元素。但不一定是有用)。
在 HTML 4.01 中, id 属性不能用于: ,
, , , , , , 和
。</p>
<p>注意: HTML 4.01 对于 id 的值有严格的限制 (例如：在 HTML 4.01 id 值不能以数字开头)。</p>
<p>语法</p>
<pre class="brush:html;toolbar:false">
<p>属性值</p>
<p>id规定元素的唯一 id。</p>
<p>命名规则：</p>
<ul style="list-style-type: disc">
<li>
<p>必须以字母 A-Z 或 a-z 开头</p>
<li>
<p>其后的字符：字母(A-Za-z)、数字(0-9)、连字符("-")、下划线("_")、冒号(":") 以及点号(".")</p>
<li>
<p>值对大小写敏感</p>
<p>示例如下：</p>
<pre class="brush:html;toolbar:false"> <title>123 function displayResult(){document.getElementById("myHeader").innerHTML="Have a nice day!";}</p>
<h1><span class="ez-toc-section" id="Hello_World"></span>Hello World!<span class="ez-toc-section-end"></span></h1>
<p><button>编辑文本</button></p>
<p>输出结果：</p>
<p>点击按钮前</p>
<p><noscript><img decoding="async" src="//cdn.chuangxiangniao.com/2025/03/20250314142028872.png" title="https://cdn.chuangxiangniao.com/2025/03/20250314142028872.png" alt="06.png"></noscript><img decoding="async" class="j-lazy" src="https://www.chuangxiangniao.com/wp-content/themes/justnews/themer/assets/images/lazy.png" data-original="//cdn.chuangxiangniao.com/2025/03/20250314142028872.png" title="https://cdn.chuangxiangniao.com/2025/03/20250314142028872.png" alt="06.png"></p>
<p>点击按钮后</p>
<p><noscript><img decoding="async" src="//cdn.chuangxiangniao.com/2025/03/20250314142028590.png" title="https://cdn.chuangxiangniao.com/2025/03/20250314142028590.png" alt="07.png"></noscript><img decoding="async" class="j-lazy" src="https://www.chuangxiangniao.com/wp-content/themes/justnews/themer/assets/images/lazy.png" data-original="//cdn.chuangxiangniao.com/2025/03/20250314142028590.png" title="https://cdn.chuangxiangniao.com/2025/03/20250314142028590.png" alt="07.png"></p>
<p>推荐教程：《html视频教程》</p>
<p>以上就是html中id是什么意思的详细内容，更多请关注【创想鸟】其它相关文章！</p>
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<p>在JavaScript中，export的意思是“导出”；JavaScript中模块内的所有声明都是本地的，利用export关键字可以导出模块，该命令可以出现在模块的任何位置，导出模块后其他JS文件就可以通过import命令加载该模块。 本教…</p>
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javascript怎样控制不能输入汉字 </a>
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<span><i class="item-images-el j-lazy" style="background-image: url('https://www.chuangxiangniao.com/wp-content/themes/justnews/themer/assets/images/lazy.png');" data-original="//cdn.chuangxiangniao.com/2025/03/20250314061030420.jpg"></i></span><span><i class="item-images-el j-lazy" style="background-image: url('https://www.chuangxiangniao.com/wp-content/themes/justnews/themer/assets/images/lazy.png');" data-original="//cdn.chuangxiangniao.com/2025/03/20250314141034654.png"></i></span><span><i class="item-images-el j-lazy" style="background-image: url('https://www.chuangxiangniao.com/wp-content/themes/justnews/themer/assets/images/lazy.png');" data-original="//cdn.chuangxiangniao.com/2025/03/20250314141038893.png"></i></span><span><i class="item-images-el j-lazy" style="background-image: url('https://www.chuangxiangniao.com/wp-content/themes/justnews/themer/assets/images/lazy.png');" data-original="//cdn.chuangxiangniao.com/2025/03/20250314141038506.png"></i></span> </a>
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<p>方法：1、利用正则表达式判断是否为汉字并禁止输入，匹配汉字的正则表达式语法为“/[u4E00-u9FA5]/g”；2、利用Unicode字符范围控制不能输入汉字，汉字的编码都是大于255，所以只要编码大于255的都是汉字。 本教程操作环境：…</p>
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JavaScript中的api是什么 </a>
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<p>在JavaScript中，api的意思是“应用编程接口”，是“application programming interface”的缩写，是提供给不同语言的接口，用于对应的函数里面提供相应的方法，只要用js的语法去调用想要的功能就可以。 本…</p>
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javascript怎样替换文本框选中的值 </a>
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<p>在JavaScript中，可以利用value属性替换文本框选中的值，该属性可以设置或者返回密码域的默认值，通过获得文本框对象，修改其value属性值 ，便可修改文本框的值，语法为“指定文本选中对象.value=’替换后的值…</p>
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javascript中writeln的意思是什么 </a>
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<p>在JavaScript中，writeln的意思是“换行输出”，用于向文档写入HTML表达式或JavaScript代码，并且在每个表达式后写一个换行符，语法为“document.writeln(exp1,exp2,exp3,….)…</p>
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type="text/javascript"表示什么意思 </a>
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<p>“type=”text/javascript””通常与script标签配合使用，用于表示文本是属于javascript脚本；script标签的type属性用于设置脚本的MIME类型，将类型设置为javascript脚…</p>
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JavaScript类型转换（详解及实例） </a>
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<p>本篇文章给大家带来了javascript中类型转换的相关知识，将值转换为原始值、转换为数字和转换为字符串，这刚好对应了引擎内部的三种抽象操作:toprimitive()、tonumber()、tostring()，希望对大家有帮助。 Jav…</p>
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"@id": "https://www.chuangxiangniao.com/p/2940550.html",
"url": "https://www.chuangxiangniao.com/p/2940550.html",
"headline": "html中id是什么意思",
"image": ["http://cdn.chuangxiangniao.com/2025/03/20250314062028499.jpg","http://cdn.chuangxiangniao.com/2025/03/20250314142028872.png","http://cdn.chuangxiangniao.com/2025/03/20250314142028590.png"],
"description": "在html中，id是“Identity document”的缩写，是“身份标识号”的意思，该属性用于规定元素的唯一id，该属性可用作链接锚，通过JavaScript或通过CSS为带有指定id的元素改变或添加样式。 本教程操作环境：windo…",
"datePublished": "2025-03-11T21:45:49+08:00",
"dateModified": "2025-03-11T21:45:49+08:00",
"author": {"@type":"Person","name":"PHP中文网","url":"https://www.chuangxiangniao.com/user/31","image":"//cdn.chuangxiangniao.com/member/avatars/20250217034650194.jpg"} }
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