js 打开app应用，如果没有安装就去下载

废话不多说，直接上代码

var APPCommon = {
    iphoneSchema: 'XingboTV://',
    iphoneDownUrl: 'https://itunes.apple.com/cn/app/xing-botv-mei-nu-shuai-ge3d/id1098066581?l=en&mt=8',
    androidSchema: 'scheme://com.xingbo/',
    androidDownUrl: 'http://webrs.xingbo.tv/app/XingboLive-release.apk',
    openApp: function(){
        var this_  =  this;
        //微信
        if(this_.isWeixin()){
            $(".weixin-tip").css("height",$(window).height());
            $(".weixin-tip").show();
            $('.weixin-tip').on('touchstart', function () {
                $(".weixin-tip").hide();
            });

        }else{//非微信浏览器
            if (navigator.userAgent.match(/(iPhone|iPod|iPad);?/i)) {
                var loadDateTime = new Date();
                window.setTimeout(function() {
                    var timeOutDateTime = new Date();
                    if (timeOutDateTime - loadDateTime < 5000) {
                        window.location = this_.iphoneDownUrl;//ios下载地址
                    } else {
                        window.close();
                    }
                },25);
                window.location = this.iphoneSchema;
            }else if (navigator.userAgent.match(/android/i)) {
                try {
                    window.location = this_.androidSchema;
                    setTimeout(function(){
                        window.location=this_.androidDownUrl; //android下载地址

                    },500);
                } catch(e) {}
            }
        }
    },
    isWeixin: function(){ //判断是否是微信
        var ua = navigator.userAgent.toLowerCase();
        if (ua.match(/MicroMessenger/i) == "micromessenger") {
            return true;
        } else {
            return false;
        }
    }

};

　　代码中包括了了iphone,android的，还有微信的判断