<script type="text/javascript">
    var browser = {
        versions: function() {
            var u = navigator.userAgent, app = navigator.appVersion;
            return {//移动终端浏览器版本信息
                trident: u.indexOf(‘Trident‘) > -1, //IE内核
                presto: u.indexOf(‘Presto‘) > -1, //opera内核
                webKit: u.indexOf(‘AppleWebKit‘) > -1, //苹果、谷歌内核
                gecko: u.indexOf(‘Gecko‘) > -1 && u.indexOf(‘KHTML‘) == -1, //火狐内核
                mobile: !!u.match(/AppleWebKit.*Mobile.*/) || !!u.match(/AppleWebKit/), //是否为移动终端
                ios: !!u.match(/\(i[^;]+;( U;)? CPU.+Mac OS X/), //ios终端
                android: u.indexOf(‘Android‘) > -1 || u.indexOf(‘Linux‘) > -1, //android终端或者uc浏览器
                iPhone: u.indexOf(‘iPhone‘) > -1 || u.indexOf(‘Mac‘) > -1, //是否为iPhone或者QQHD浏览器
                iPad: u.indexOf(‘iPad‘) > -1, //是否iPad
                webApp: u.indexOf(‘Safari‘) == -1 //是否web应该程序，没有头部与底部
            };
        }(),
        language: (navigator.browserLanguage || navigator.language).toLowerCase()
    }

    function is_weixin() {
        var ua = navigator.userAgent.toLowerCase();
        var isIosQQ = ( /(iPhone|iPad|iPod|iOS)/i.test(navigator.userAgent) && /\sQQ/i.test(navigator.userAgent));
        var isAndroidQQ = ( /(Android)/i.test(navigator.userAgent) && /MQQBrowser/i.test(navigator.userAgent) && /\sQQ/i.test((navigator.userAgent).split(‘MQQBrowser‘)));
        var isQQ = isIosQQ || isAndroidQQ;    
        if (ua.match(/MicroMessenger/i) == "micromessenger" || isQQ) {
            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‘;
        if(browser.versions.ios || browser.versions.iPhone || browser.versions.iPad){
            div.innerHTML = ‘<p><img style="width:80%" src="ios.png" alt="微信打开"/></p>‘;
        }else if(browser.versions.android){
            div.innerHTML = ‘<p><img style="width:80%" src="android.png" 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);
    }
</script>