Meta elements in the head of a mobile page

<meta http-equiv= "Pragma" content= "No-cache" >
<meta http-equiv= "Expires" content= "0" >
<meta http-equiv= "Cache-control" content= "No-cache" >

Clear the browser in the cache, it and other words together, it will allow you to re-enter the page you have visited, ie browser must download the latest content from the server, to achieve the effect of the refresh. Avoid HTML page caching.

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

The height of the width-viewport width height-viewport

Initial-scale-Initial zoom ratio

Minimum-scale-Minimum scale to allow the user to zoom

Maximum-scale-Maximum scale to which the user is allowed to zoom

User-scalable-whether the user can manually scale

Meta elements in the head of a mobile page