虚拟窗口 

<meta name="viewport" content="width=device-width,initial-scale=1,minimum-scale=1,maximum-scale=1,user-scalable=no" />

<meta http-equiv="X-UA-Compatible" content="ie=edge,chrome=1">

<meta name="Keywords" content="关键字"/>
<meta name="Description" content="网站描述信息"/>