<script>

    $(document).ready(function(){

        var ua = navigator.userAgent;

        var ipad = ua.match(/(iPad).*OS\s([\d_]+)/),

        isIphone = ua.match(/(iPhone\sOS)\s([\d_]+)/),

        isAndroid = ua.match(/(Android)\s+([\d.]+)/);

        if(isIphone!=null || isAndroid!=null || ipad!=null){

            //isIphone!=null  打开设备为Iphone

 } }); </script>