代码如下：

<meta name="viewport" content="target-densitydpi=device-dpi, width=device-width, minimum-scale=1.0, maximum-scale=1.0, user-scalable=no" />

同样你可以设置默认width和缩放比例 meta name="viewport" content="width=320, initial-scale=1.0, minimum-scale=1.0, maximum-scale=1.0"