app下载处理

yxh_down.js

var Emt = (function() {
    var env = {},
            navigator = window.navigator,
            userAgent = navigator.userAgent,
            ios = userAgent.match(/(iPad|iPhone|iPod)[^;]*;.+OS\s([\d_\.]+)/),
            android = userAgent.match(/(Android)\s([\d\.]+)/);
    env.isAndroid = (/android/gi).test(navigator.appVersion);
    env.isIDevice = (/iphone|ipad|ipod/gi).test(navigator.appVersion);
    env.isWebkit = /WebKit\/[\d.]+/i.test(userAgent);
    env.isSafari = ios ? (navigator.standalone ? env.isWebkit : (/Safari/i.test(userAgent) && !/CriOS/i.test(userAgent) && !/MQQBrowser/i.test(userAgent))) : false;
    env.isUC = /uc/i.test();
    if (ios) {
        env.device = ios[1];
        env.version = ios[2].replace(/_/g, '.');
    } else if (android) {
        env.version = android[2];
    }
    env.standalone = navigator.standalone;
    env.wechat = navigator.userAgent.indexOf("MicroMessenger") >= 0;
    return env;
})();
if (Emt.standalone && Emt.version < "7.0") {
    document.write('<meta name="apple-mobile-web-app-capable" content="yes">');
}

var MPage = MPage = {};

$.extend(MPage, {
    cache: {},
    init: function() {
        var that = this;

        //底部提示
        var $app_guide = $("#j-app_guide");
        $app_guide.find(".btn-close").bind("click", function(e) {
            e.preventDefault();
            $app_guide.remove();
            $(window).unbind("scroll.app");
        });

        //滚动显示
        $(window).bind("scroll.app", function() {
            if (window.scrollY > 79) {
                $app_guide.show();
                $("body").css({marginBottom: "50px"});
            } else {
                $app_guide.hide();
                $("body").css({marginButton: "0px"});
            }
        });

        //下载按钮
        var $app_download = $("#j-app_guide .btn,#j-app_downbtn,.j-app_downbtn"),
                app_down_url;

        //下载链接
        if (Emt.isIDevice) {
            app_down_url = $app_download.attr('data-i');
        } else if (Emt.wechat) {
            app_down_url = $app_download.attr('href');
        } else if (Emt.isAndroid) {
            app_down_url = $app_download.attr('data-a');
        } else {
            app_down_url = $app_download.attr('href');
        }
        $app_download.attr("href", app_down_url);

        //点击下载或启动
        $app_download.bind("click", function() {
            if (Emt.isAndroid) {
                AndroidConnect.launch('zizhuAPP://launch?type=main', function() {
                    document.location.href = app_down_url;//失败时调用
                });
                return false;
            }else if (app_down_url.indexOf('http') > -1){
                //document.location.href = app_down_url;
                //return false;
            }
        });
    }
});

var AndroidConnect = {
    initLaunch: function() {
        var _this = this;

        if (!this.frame) {
            this.frame = document.createElement("iframe");
            this.frame.height = "0";
            this.frame.width = "0";
            this.frame.frameBorder = 0;

            document.body.appendChild(this.frame);
            this.timeout = 1000;

            window.onblur = function() {
                clearTimeout(_this.timer);
                _this.timer = null;
            };

            this.frame.onload = function() {
                console.log("404 onload");
                if (_this.timer == null) {
                    return;
                }
                clearTimeout(_this.timer);
                _this.timer = null;
                _this.launchFallback(new Date() - 0);
            }

            this.frame.onerror = function() {
                console.log("onerror");
                if (_this.timer == null) {
                    return;
                }
                clearTimeout(_this.timer);
                _this.timer = null;
                _this.launchFallback(new Date() - 0);
            }
        }
    },
    launchFallback: function(start_time) {
        var now_time = Date.now();

        console.log(now_time - start_time, this.timeout + 200);
        if (!start_time || now_time - start_time < this.timeout + 200) {
            this.fallback();
        }
    },
    launch: function(launch_url, fallback) {
        var _this = this,
                start_time = Date.now();

        this.launch_url = launch_url || 'zizhuAPP://launch';
        this.fallback = typeof fallback === "function" ? fallback : function() {
        };

        this.initLaunch();

        //超时错误
        if (this.fallback) {
            this.timer = setTimeout(function() {
                _this.launchFallback(start_time);
            }, _this.timeout);
        }

        this.redirect();
    },
    redirect: function() {
        this.frame.setAttribute("src", this.launch_url);
    }
}
MPage.init();