第 30 章 使用 Emmet 插件_html/css_WEB-ITnose
学习要点：
1.安装方式
2.自定义！生成
3.快速生成
主讲教师：李炎恢
本章主要探讨了解一下 Sublime Text3 的一个 HTML5 代码提示插件：Emmet，这个插件比自带原生的要强大许多。
一．安装方式
Emmet 插件安装一般采用两种方式，1.通过命令安装；2.下载离线安装。我这里直接采用的是下载离线安装方式。具体步骤：
1.解压下载好的 Emmet 插件包(这里会提供)；
2.将 Emmet 和 PyV8 两个文件夹复制到 Sublime Text3 的程序包中；
3.左下角会显示自动安装，安装好后，重启 Sublime Text3；4.在编辑器输入英文状态下的“!”，然后 ctrl+e，出现了 HTML5 的代码库，则安装
成功。
注：如果安装失败或出现其他错误，请自行百度选用其他方式安装，或解决安装出错的问题。
二．自定义！生成
我们输入!，然后 ctrl+e，默认情况下会出现如下代码：
//默认代码
<!doctype html><html lang="en"> <head> <meta charset="UTF-8"> <title>Document</title> </head> <body> </body></html>
这里有两个地方和我们之前生成的代码不一样，第一处是：doctype 没有大写；第二处：lang 是 en 的。其实这两处不改也没有太大关系，但有强迫症的看了可能会难受。具体修改方法如下：
1.首先，进入程序包 pagkages；
2.其次，进入 Emmet 文件夹，再进入 emmet 文件夹，找到 snippets.json 文件；
3.最后，打开这个文件，找到相应处修改即可。
三．快速生成
Emmet 提供了非常丰富的 HTML 和 CSS 代码的快速生成功能，通过使用快速生成代码，极大的增加了开发速度。只不过，Emmet 提供的生成方式需要二次学习，起初可能还不如手工敲击的快。所以，需要一定时间的学习磨合。
//快速生成 HTML5 代码结构
! + (ctrl + e 或 tab 键) 或 html:5 + tab 键
<!DOCTYPE html><html lang="zh-cn"> <head> <meta charset="UTF-8"> <title>Document</title> </head> <body> </body></html>
所有代码生成，都需要通过 tab 键来生成代码，后面不在赘述。
//快速生成标签代码 a
<a href=""></a>
//快速生成标签相应的属性值a:link、a:mail
<a href="http://"></a> <br /><a href="mailto:"></a>
//生成标签内的值a{超链接}
<a href="">超链接</a>
//生成 CSS 链接 link link
<link rel="stylesheet" href="">
//生成表单控件input、input:hidden
<input type="text"><input type="hidden" name="">
//生成带子标签的一组标签ul+、ol+、dl+、table+
<ul> <li></li></ul><ol> <li></li></ol><dl> <dt></dt> <dd></dd></dl><table> <tr> <td></td> </tr></table>
//生成嵌套子标签 nav>ul>li
<nav> <ul> <li></li> </ul></nav>
//生成相邻兄弟标签 div+p+h1
<div></div><p></p><h1></h1>
//生成乘积数量的标签 ul>li*5
<ul> <li></li> <li></li> <li></li> <li></li> <li></li></ul>
//创建具有 ID 的标签 div#header
<div id="header"></div>
//创建具有 class 的标签 div.header、div.header.sidebar
<div class="header"></div><div class="header sidebar"></div>
以上是 HTML 部分的代码生成功能，下面来看下 CSS 的快速生成功能：
//生成 position: relative pos
输入 pos 即可出现 position:relative 这组 CSS 样式，并且 relative 是选定状态，有助于你更换属性值。
但是我们发现使用 sublime 结合 Emmet 插件的 CSS 提示非常的灵活，不会死板的必须要输入 pos。下面的输入都可以得到相应的值：
po = position: relative
只要输入 po 或者大于 po 字母量的值，都可以得到 position:relative。当然，如果你只是输入 p，那么由于优先级的考虑，出现的是 padding: |。
如果你输入有误，它也会自动纠错，比如下面这个：
pod = position: relative
如果你想一开始得到的是 absolute 这个属性值，那么直接输入：
poa = position: absolute;
当然，上门的标准写法是这样的：
pos:a = position: absolute;
如果想输入背景的属性，直接使用 bg 即可：
bg = background: |;
使用 bg+可以展开背景属性的完整形式： bg+ = background: #fff url() 0 0 no-repeat;
使用 bg:n 可以设置背景属性值为 none： bg:n = background: none;
备注：HTML 和 CSS 其他大部分代码生成方案，可以参考如下网址：
http://docs.emmet.io/cheat-sheet/
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