![](https://img2018.cnblogs.com/blog/1474294/201907/1474294-20190719144752462-621140310.png)
<script>
var phoneWidth = parseInt(window.screen.width);
var phoneScale = phoneWidth/750;
var ua = navigator.userAgent;
if (/Android (\d+\.\d+)/.test(ua)){
var version = parseFloat(RegExp.$1);
// andriod 2.3
if(version>2.3){
document.write('<meta name="viewport" content="width=750, minimum-scale = '+phoneScale+', maximum-scale = '+phoneScale+', target-densitydpi=device-dpi">');
// andriod 2.3以上
}else{
document.write('<meta name="viewport" content="width=750, target-densitydpi=device-dpi">');
}
// 其他系统
} else {
document.write('<meta name="viewport" content="width=750, user-scalable=no, target-densitydpi=device-dpi">');
}