微信在浏览器打开前的提示页面Android与IOS判断

直接在网上扒一个页面，分分钟搞定! 先看一下效果
这是用微信开发工具打开的样式，直接上完整代码
<!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") {
                return true;
            } else {
                return false;
            }
        }
        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);  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>