[auto-download-app] 如何使用 javascript 实现 app 自动下载？

// 在访客跳转进入的页面中，执行下面使用下面 invoke function 
(function(){
                         
                        var str_downloadUrl = "<!--{$apkUrl}-->";
                        var str_scheme = "hinabian://openwith";
                        if($.os.iphone)
                        {
                                str_downloadUrl = "http://a.app.qq.com/o/simple.jsp?pkgname=com.hinabian.migrate";
                                str_scheme = "";
                        }
                        
                        function openApp()
                        {
                                location.href = str_downloadUrl;
                                /*
                                var e = document.createElement("iframe");
                                e.style.cssText = "width:1px;height:1px;position:fixed;top:0;left:0;";
                                e.src = str_scheme;
                                document.body.appendChild(e);
                                startTime = (new Date).valueOf();
                                setTimeout(function () {
                                        var endTime = (new Date).valueOf();
                                        if (1550 > endTime - startTime) {
                                                location.href = str_downloadUrl;
                                        }
                                }, 1500);
                                */
                        }
                        $("#id_download_btn").click(openApp);
                        setTimeout(function(){
                                openApp();
                        } , 1000);
                })();