html5页面中打开本地app，如果没有跳转下载页面的解决方案

需求效果

在推广网页上用户点击产品的详细信息时，判断出这个用户手机上是否安装自己的app如果安装了直接自动打开手机内的app应用，若没有则跳转app的下载页

技术实现

直接用window.location.href的方法解决，这个方法的前提条件是需要知道自己app对应的打开协议，如贴吧APP，协议为：com.baidu.tieba://（下边以贴吧为例）

<!-- a标签点击打开的动作，在click事件中注册 -->
<a href="javascript:;" id="openApp">贴吧客户端</a>
<script type="text/javascript">document.getElementById('openApp').onclick = function(e){window.location.href = "com.baidu.tieba://";window.setTimeout(function(){window.location.href = "https://itunes.apple.com/cn/app/id477927812";//打开app下载地址，由app开发人员提供},2000)};</script>

因为Android和iOS的下载包和协议是不同的所以需要判断一下用户的系统类型

<body><a href="javascript:;" id="openApp">贴吧客户端</a>
</body><script type="text/javascript">document.getElementById('openApp').onclick = function(e){if(navigator.userAgent.match(/(iPhone|iPod|iPad);?/i)){window.location.href = "com.baidu.tieba://";//ios app协议window.setTimeout(function() {window.location.href = "https://itunes.apple.com/cn/app/id477927812";}, 2000)}if(navigator.userAgent.match(/android/i)){window.location.href = "com.baidu.tieba://app";//android app协议window.setTimeout(function() {window.location.href = "https://****.apk";//android 下载地址}, 2000)    }};</script>

但是用window.location.href方法的话当手机中有目标应用时，应用打开，但是浏览器也会跳转到下载页面，而且微信浏览器不支持打开、下载第三方app，所以做微信活动页的coder们当遇到需要实现该需求时所考虑的就更多了。
京东针对于这个问题的解决方案。如下

(function(){
// 判断浏览器var Navigator = navigator.userAgent;var ifChrome = Navigator.match(/Chrome/i) != null && Navigator.match(/Version\/\d+\.\d+(\.\d+)?\sChrome\//i) == null ? true : false;var ifAndroid = (Navigator.match(/(Android);?[\s\/]+([\d.]+)?/)) ? true : false;var ifiPad = (Navigator.match(/(iPad).*OS\s([\d_]+)/)) ? true : false;var ifiPhone = (!ifiPad && Navigator.match(/(iPhone\sOS)\s([\d_]+)/)) ? true : false;var ifSafari = (ifiPhone || ifiPad) && Navigator.match(/Safari/);var version =0;ifSafari && (version = Navigator.match(/Version\/([\d\.]+)/));version = parseFloat(version[1],10);// 是否从微信打开var ifWeixin = navigator.userAgent.indexOf("MicroMessenger") >=0; // weixinvar j = false;var iframe = "plugIn_downloadAppPlugIn_loadIframe";var t = false;var i =0;var B = {};var b = {};var selector = null;var Hquery = {};// 判断当前使用的js框架是zepto还是jqueryvar Query = window.Zepto || window.jQuery ? true : false;var g = [];// 是否存在html5的localStorage 存储var v = window.localStorage ? true : false;var o = "mdownloadAppPlugInskip";var p = null;function m() { // 打印时间 例如:2016-5-18 var M = new Date(); var N = M.getFullYear(); var O = M.getMonth() +1; var L = M.getDate(); strDate = N + "-" + O + "-" + L; return strDate }// 微信相关操作function r() { // weixin api WeixinJSBridge.invoke("getInstallState", { packageName: "com.jingdong.app.mall", packageUrl: "openApp.jdMobile://" }, function(M) { var N = M.err_msg, L =0; if (N.indexOf("get_install_state:yes") > -1) { j = true } }) }// 根据是否存在js框架进行dom和时间的绑定function bind(dom, event, fun) { // bind event if (Query) { selector("#" + dom).bind(event, fun) } else { selector("#" + dom).addEventListener(event, fun, !1) } }function z(L) { var M = (L || "mGen") + (++i); return M }// 微信操作if (ifWeixin) { // if navigitor is weixin if (window.WeixinJSBridge && WeixinJSBridge.invoke) { r() } else { document.addEventListener("WeixinJSBridgeReady", r, !1) } }// 如果存在js框架if (Query) { selector = window.$; Hquery = window.$ } else { selector = function(obj) { if (typeof obj == "object") { return obj } return document.querySelector(obj); }; if (!window.$) { window.$ = Hquery = selector } else { Hquery = window.$ } }window.onblur = function() { for (var L =0; L < g.length; L++) { clearTimeout(g[L]) } }; // 设置cookie。 function e(N) { var M = document.cookie.indexOf(N + "="); if (M == -1) { return "" } M = M + N.length +1; var L = document.cookie.indexOf(";", M); if (L == -1) { L = document.cookie.length } return document.cookie.substring(M, L) } // 设置cookie function l(N, P, L, Q, O) { var R = N + "=" + escape(P); if (L != "") { var M = new Date(); M.setTime(M.getTime() + L *24 *3600 *1000); R += ";expires=" + M.toGMTString() } if (Q != "") { R += ";path=" + Q } if (O != "") { R += ";domain=" + O } document.cookie = R } // 打开的链接集合 function F(L) { var url = { downAppURl: "http://h5.m.jd.com/active/download/download.html?channel=jd-m", downAppIos: "http://union.m.jd.com/download/go.action?to=http%3A%2F%2Fitunes.apple.com%2Fcn%2Fapp%2Fid414245413&client=apple&unionId=12532&subunionId=m-top&key=e4dd45c0f480d8a08c4621b4fff5de74", downWeixin: "http://a.app.qq.com/o/simple.jsp?pkgname=com.jingdong.app.mall&g_f=991850", downIpad: "https://itunes.apple.com/cn/app/jing-dong-hd/id434374726?mt=8", inteneUrl: "openApp.jdMobile://360buy?type=1", inteneUrlParams: null, openAppBtnId: "", closePanelBtnId: "", closePanelId: "", closeCallblack: null, closeCallblackSource: null, cookieFlag: null, noRecord: false, sourceType: "JSHOP_SOURCE_TYPE", sourceValue: "JSHOP_SOURCE_VALUE", openAppEventId: "MDownLoadFloat_OpenNow", closePanelEventId: "MDownLoadFloat_Close" }; if (L) { for (var M in L) { if (M && L[M]) { url[M] = L[M] } } } return url } // 敲黑板 重点内容。看京东是怎么解决兼容问题的。 function openApp(N, L) { // openApp var R = h(N); //获取相对应的url var O = null; if (ifWeixin) { // 如果是微信端 var M = null; if (j) { M = R } else { M = N.downWeixin } location.href = M; // 直接使用location.href打开 return } if (ifiPad) { // 如果是ipad O = N.downIpad } else { if (ifiPhone) { // 如果是iphone O = N.downAppIos } else { O = N.downAppURl } } if (ifChrome) { // 如果是chrome if (ifAndroid) { //安卓浏览器 var Q = R; R = y(Q); // 延后50毫秒 setTimeout(function() { window.location.href = R },50) } } if (ifSafari && version >=9) { // 判断safari版本 如果大于9 setTimeout(function() { // 必须要使用settimeout var S = document.createElement("a"); //创建a元素 S.setAttribute("href", R), S.style.display = "none", document.body.appendChild(S); var T = document.createEvent("HTMLEvents"); // 返回新创建的 Event 对象，具有指定的类型。 T.initEvent("click", !1, !1)// 初始化新事件对象的属性, S.dispatchEvent(T) // 绑定事件 },0) } else { document.querySelector("#" + iframe).src = R // 将iframe增加src } var P = Date.now(); setTimeout(function() { if (L) { var S = setTimeout(function() { x(P, O) },1500); g.push(S) } },100) } // x方法 function x(N, downUrl) { var L = Date.now(); if (N && (L - N) <(1500 +200)) { window.location.href = downUrl } } function h(N) { var V = []; var P = N.inteneUrlParams; var T = { category: "jump", des: "productDetail" }; if (N.sourceType && N.sourceValue) { T.sourceType = N.sourceType; T.sourceValue = N.sourceValue; if (P && !P.sourceType && !P.sourceValue) { P.sourceType = N.sourceType; P.sourceValue = N.sourceValue } } if (P) { for (var U in P) { if (U && P[U]) { V.push('"' + U + '":"' + P[U] + '"') } } } else { for (var U in T) { if (U && T[U]) { V.push('"' + U + '":"' + T[U] + '"') } } } try { var Q = MPing.EventSeries.getSeries(); if (Q) { var W = JSON.parse(Q); W.jdv = encodeURIComponent(e("__jdv")); W.unpl = encodeURIComponent(e("unpl")); W.mt_xid = encodeURIComponent(e("mt_xid")); W.mt_subsite = encodeURIComponent(e("mt_subsite")) } var S = { mt_subsite: encodeURIComponent(e("mt_subsite")), __jdv: encodeURIComponent(e("__jdv")), unpl: encodeURIComponent(e("unpl")), __jda: encodeURIComponent(e("__jda")) }; Q = JSON.stringify(W); V.push('"m_param":' + Q); V.push('"SE":' + JSON.stringify(S)) } catch (R) { V.push('"m_param":null') } var M = "{" + V.join(",") + "}"; var O = N.inteneUrl.split("?"); var L = null; if (O.length ==2) { L = O[0] + "?" + O[1] + "¶ms=" + M } else { L = O[0] + "?params=" + M } return L } function y(L) { return "intent://m.jd.com/#Intent;scheme=" + L + ";package=com.jingdong.app.mall;end" } function n(L) { if (L.openAppBtnId) { B[L.openAppBtnId] = L; G(L.openAppBtnId, L.openAppEventId); bind(L.openAppBtnId, "click", function() { var P = this.getAttribute("id"); var M = B[P]; if (!t) { var N = document.createElement("iframe"); N.id = iframe; document.body.appendChild(N); document.getElementById(iframe).style.display = "none"; document.getElementById(iframe).style.width = "0px"; document.getElementById(iframe).style.height = "0px"; t = true } var O = M.cookieFlag ? "downloadAppPlugIn_downCloseDate_" + M.cookieFlag : "downloadAppPlugIn_downCloseDate"; l(O, Date.now() + "_2592000000",60, "/", "m.jd.com"); l(O, Date.now() + "_2592000000",60, "/", "m.jd.hk"); openApp(M, true) }) } } function D(M) { if (M.closePanelBtnId && M.closePanelId) { B[M.closePanelBtnId] = M; G(M.closePanelBtnId, M.closePanelEventId); var Q = M.cookieFlag ? "downloadAppPlugIn_downCloseDate_" + M.cookieFlag : "downloadAppPlugIn_downCloseDate"; var O = e(Q); var P = null; if (O) { P = O.split("_"); if (P.length ==2) { P[0] = parseInt(P[0],10); P[1] = parseInt(P[1],10) } else { P = null } } var L = Date.now(); if (Html5Plus() || (!M.noRecord && P && P.length ==2 && (L - P[0]) < P[1])) { document.querySelector("#" + M.closePanelId).style.display = "none"; if (M.closeCallblack) { var N = M.closeCallblackSource ? M.closeCallblackSource : null; M.closeCallblack.call(N) } return } else { document.querySelector("#" + M.closePanelId).style.display = "block" } bind(M.closePanelBtnId, "click", function() { var U = this.getAttribute("id"); var R = B[U]; var T = R.cookieFlag ? "downloadAppPlugIn_downCloseDate_" + R.cookieFlag : "downloadAppPlugIn_downCloseDate"; if (!R.noRecord) { l(T, Date.now() + "_259200000",60, "/", "m.jd.com"); l(T, Date.now() + "_259200000",60, "/", "m.jd.hk") } document.querySelector("#" + R.closePanelId).style.display = "none"; if (R.closeCallblack) { var S = R.closeCallblackSource ? R.closeCallblackSource : null; R.closeCallblack.call(S) } }) } } function Html5Plus() { // htmlplus if (Navigator.indexOf("Html5Plus") >=0) { return true } else { return false } } function G(P, M) { try { var O = document.getElementById(P); var L = O.className; if (L) { L = L + " J_ping" } else { L = "J_ping" } O.className = L; O.setAttribute("report-eventid", M) } catch (N) {} } function C(L) { var M = F(L); n(M); D(M) } Hquery.downloadAppPlugIn = C; Hquery.downloadAppPlugInOpenApp = function(L) { var M = F(L); openApp(M); } });

这个虽然看起来比较繁琐，而且得着实的理解一下，但是一个比较全面的解决办法

针对于上述方法，都是代码逻辑实现，可能存在一些未知问题或者代码比较繁琐不易上手，下面我说一下一个比较简单的方法，跳转应用宝商店下载相应app，只需要一个a标签

基于应用宝实现页面中打开本地app，如果没有跳转下载页面的解决方案

以上方法代码转载于下面理解，多谢大神提供解决办法
【JS】点击页面判断是否安装app并打开,否则跳转下载的方法
京东在html5页面中打开本地app的解决方案
大家也可以访问我的博客，有什么需要可以留言，也可以互相友联