禁止放大 input框,input的只读属性
<input type="text" readonly="readonly" unselectable="on" onfocus="this.blur();"/>
或者在<head>中加上这句
<meta name="viewport" content="width=device-width, initial-scale=1.0, minimum-scale=1.0, maximum-scale=1.0, user-scalable=no">