本文主要介绍 Emmet 的 HTML 语法，看完之后，你就会看懂并且会写出那句代码了。现在，打开你的 ST2 然后新建一个 HTML 文档，跟着文章，即时输入对应的指令然后亲自尝试一下！生成 HTML 文档初始结构HTML 文档的初始结构，就是包括 doctype、html、head、body 以及 meta 等内容。你只需要输入一个 “!” 就可以生成一个 HTML5 的标准文档初始结构，你没有看错，输入一个感叹号（当然是英文符号），然后摁下 TAB 键，就会发现生成了下面的结构：
<!doctype html>
<html>
<head>
<meta charset="UTF-8">
<title>Document</title>
</head>
<body>
</body>
</html>这就是一个 HTML5 的标准结构，也是默认的 HTML 结构。如果你想生成 HTML4 的过渡型结构，那么输入指令 html:xt 即可生成如下结构：
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en">
<head>
<meta http-equiv="Content-Type" content="text/html;charset=UTF-8">
<title>Document</title>
</head>
<body>
</body>
</html>Emmet 会自动把 doctype 给你补全了，怎么样，这样的功能会不会让你动心？简单总结一下常用的 HTML 结构指令：
html:5 或者 ! 生成 HTML5 结构
html:xt 生成 HTML4 过渡型
html:4s 生成 HTML4 严格型
生成带有 id 、class 的 HTML 标签
Emmet 的语法有点类似 CSS 的语法，生成 id 为 aaa 的 div 标签，我们只需要编写下面指令：
#aaa
Emmet 默认的标签为 div ，如果我们不给出标签名称的话，默认就生成 div 标签。如果编写一个 class 为 bbb 的 span 标签，我们需要编写下面指令：
span.bbb
然后就生成了对应的结构。同理，如果想要编写一个 id 为 ccc 的 class 为 ddd 的 ul 标签，我们可以这样写：
ul#ccc.ddd
很简单吧？比你用手写 id 、class 方便多了吧
生成后代：>
大于号表示后面要生成的内容是当前标签的后代。例如我要生成一个无序列表，而且被 class 为 aaa 的 div 包裹，那么可以使用下面指令：
div.aaa>ul>li
可以生成如下的结构：
<div>
<ul>
<li></li>
</ul>
</div>生成兄弟：+
上面是生成下级元素，如果想要生成平级的元素，就需要使用 + 号。例如下面指令：
div+p+bq
就可以生成如下的 HTML 结构：
<div></div> <p></p> <blockquote></blockquote>
生成上级元素：^
上级 （Climb-up）元素是什么意思呢？前面咱们说过了生成下级元素的符号“>”，当使用 div>ul>li 的指令之后，再继续写下去，那么后续内容都是在 li 下级的。如果我想编写一个跟 ul 平级的 span 标签，那么我需要先用 “^” 提升一下层次。例如：
div>ul>li^span
就会生成如下结构：
<div>
<ul>
<li></li>
</ul>
<span></span>
如果我想相对与 div 生成一个平级元素，那么就再上升一个层次，多用一个“^”符号：
div>ul>li^^span
重复生成多份：*
特别是一个无序列表，ul 下面的 li 肯定不只是一份，通常要生成很多个 li 标签。那么我们可以直接在 li 后面 * 上一些数字：
ul>li*5
这样就直接生成五个项目的无序列表了。如果想要生成多份其他结构，方法类似。
生成分组：()
用括号进行分组，这样可以更加明确要生成的结构，特别是层次关系，例如：
div>(header>ul>li*2>a)+footer>p
这样很明显就可以看出层次关系和并列关系，生成如下结构：
<div>
<header>
<ul>
<li><a href=""></a></li>
<li><a href=""></a></li>
</ul>
</header>
<footer>
<p></p>
</footer>
</div>此外，分组还可以很方便的结合上面说的 “*” 符号生成重复结构：
(div>dl>(dt+dd)*3)+footer>p
生成结构：
<div>
<dl>
<dt></dt>
<dd></dd>
<dt></dt>
<dd></dd>
<dt></dt>
<dd></dd>
</dl>
</div>
<footer>
<p></p>
</footer>生成自定义属性：[attr]
a 标签中往往需要附带 href 属性和 title 属性，如果我们想生成一个 href 为 “http://www.qianxingzhem.com” ，title 为“潜行者m 博客”的 a 标签，可以这样写：
a[href="http://www.qianxingzhem.com" title="潜行者m 博客"]
其他标签和属性都类似。
对生成内容编号：$
例如无序列表，我想为五个个 li 增加一个 class 属性值 item1 ，然后依次递增从 1-5，那么就需要使用 $ 符号：
ul>li.item$*5
这样就生成了如下结构：
<ul> <li class="item1"></li> <li class="item2"></li> <li class="item3"></li> <li class="item4"></li> <li class="item5"></li> </ul>
$ 就表示一位数字，只出现一个的话，就从1开始。如果出现多个，就从0开始。如果我想生成三位数的序号，那么要写三个 $：
ul>li.item$$$*5
输出：
<ul>
<li></li>
<li></li>
<li></li>
<li></li>
<li></li>
</ul>只能这样单调的生成序号？对于强大的 Emmet 来说，肯定不会会了，我们也可以在 $ 后面增加 @- 来实现倒序排列：
ul>li.item$@-*5
生成如下结构：
<ul>
<li></li>
<li></li>
<li></li>
<li></li>
<li></li>
</ul>同样，我们也可以使用 @N 指定开始的序号：
ul>li.item$@3*5
这样就会从 3 开始排序，生成如下代码：
<ul>
<li></li>
<li></li>
<li></li>
<li></li>
<li></li>
</ul>配合上面倒序输出，可以这样写：
ul>li.item$@-3*5
生成的就是以 3 为底倒序：
<ul>
<li></li>
<li></li>
<li></li>
<li></li>
<li></li>
</ul>生成文本内容：{}
上面讲解了如何生成 HTML 标签，那里面的内容呢？当然也可以生成了：
a[href="http://www.qianxingzhem.com"]{点击这里到 潜行者m 的博客}
这样就生成了一个到我博客的超链接了。在生成内容的时候，特别要注意前后的符号关系，虽然 a>{Click me} 和 a{Click me} 生成的结构是相同的，但是加上其他的内容就不一定了，例如：
<!-- a{click}+b{here} -->
<a href="">click</a><b>here</b>
<!-- a>{click}+b{here} -->
<a href="">click<b>here</b></a>这样就生成了完全不同的结构，注意这些小细节哦。
不要有空格
在写指令的时候，你可能为了代码的可读性，使用一些空格什么的排版一下。这就会导致代码无法使用。例如下面这句：
(header > ul.nav > li*5) + footer
而去掉空格之后，就可以正常执行生成结构了。HTML 语法部分说完了，相信大家也有很大的收获，希望这篇文章能够帮助到大家。
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