常用的meta头
1 字体编码： <meta charset = "utf-8">
2 关键字：<meta name = "keywords" content="">
3 说明：<meta name = "description" content="">
4 作者： <meta name = "author" content="">
5 设置文档宽度、是否缩放 <meta name="viewport" content="width=device-width,initial-scale=1.0,user-scalable=no"> 宽度是设备宽度，缩放1.0，用户不能缩放
6 有限使用IE最新版本或chrome <meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1">
7 360读取到这个标签立即切换到极速模式 <meta name="renderer" content="webkit">
8 搜索引擎抓取 <meta name="robots" content="index,follow">
9 为移动设备添加viewport：<meta name="viewport" content="initial-scale=1,maximum-scale=1,user-scalable=no">
10 禁止百度转码：<meta http-equiv="Cache-Control" content="no-siteapp">
11 UC强制竖屏：<meta name="screen-orientation" content="portrait">
12 QQ强制竖屏：<meta name="x5-orientation content=portrait">
13 UC强制全屏：<meta name="full-screen" content="yes">
14 QQ强制全屏：<meta name="x5-full-screen" content="yes">
15 UC应用模式：<meta name="browsermode" content="application">
16 QQ应用模式：<meta name="x5-page-mode" content="app">
17 window phone点亮无高光：<meta name="msapplication-tap-highlight" content="no">
18 安卓设备不自动识别邮件地址：<meta name="format-detection" name="email=no">
