微信在浏览器打开前的提示页面Android与IOS判断

            <!
            DOCTYPE html
            >
            <
            html 
            lang
            ="en"
            >
            <
            head
            >
            <
            meta 
            charset
            ="UTF-8"
            >
            <
            meta 
            name
            ="viewport"
             content
            ="width=device-width, initial-scale=1"
            />
            <
            title
            >忆游APP下载</title></head><body><style type="text/css">
    *{margin:0; padding:0;}
    img{max-width: 100%; height: auto;}
    .test{height: 600px; max-width: 600px; font-size: 40px;}</style><script type="text/javascript">var img =‘android.png‘;
        function is_weixin() {
            var ua = navigator.userAgent.toLowerCase();
            if(ua.indexOf(‘iphone‘) >-1){
                    img =‘iphone.png‘;
            }else{
                    img =‘android.png‘;
            }
            if (ua.match(/MicroMessenger/i) =="micromessenger") {
                returntrue;
            } else {
                returnfalse;
            }
        }
        var isWeixin = is_weixin();
        var winHeight =typeof window.innerHeight !=‘undefined‘? window.innerHeight : document.documentElement.clientHeight;

        function loadHtml(){
            var div = document.createElement(‘div‘);
            div.id =‘weixin-tip‘;
            div.innerHTML =‘<p><img src="‘+ img +‘" alt="微信打开"/></p>‘;
            document.body.appendChild(div);
        }
        
        function loadStyleText(cssText) {
            var style = document.createElement(‘style‘);
            style.rel =‘stylesheet‘;
            style.type =‘text/css‘;
            try {
                style.appendChild(document.createTextNode(cssText));
            } catch (e) {
                style.styleSheet.cssText = cssText; //ie9以下            }
            var head=document.getElementsByTagName("head")[0]; //head标签之间加上style样式            head.appendChild(style); 
        }
        var cssText ="#weixin-tip{position: fixed; left:0; top:0; background: rgba(0,0,0,0.8); filter:alpha(opacity=80); width: 100%; height:100%; z-index: 100;} #weixin-tip p{text-align: center; margin-top: 10%; padding:0 5%;}";
        if(isWeixin){
            loadHtml();
            loadStyleText(cssText);
        }else{
                window.location.href="http://static.youliaoar.com/operation/yiyou/aryiyou1.1.0.apk";
        }
    </script></body></html>