项目中 直播app分享出来的直播h5页面 点击进入按钮：已下载app 就进入app，未下载跳转到下载页面

判断是安卓还是ios

var u = navigator.userAgent;

    	var isAndroid = u.indexOf('Android') > -1 || u.indexOf('Adr') > -1; //android终端

    	var isiOS = !!u.match(/\(i[^;]+;( U;)? CPU.+Mac OS X/); //ios终端

    	if(isiOS){

    		document.getElementById('download-app').value = 'http://baidu.com';

    	}else{

    		document.getElementById('download-app').value = 'http://jd.com/8JZ5OO';

    	}

页面代码

<a id="call-app" href="javascript:;" style="display: inline-block;float: right;">

<input id="download-app" type="hidden" name="storeurl" value="http://jd.com/8JZ5OO">

<div class="intoR">

<span>立即进入</span>

</div>

</a>

已下载打开APP 未下载跳转到input的value也就是下载页面

scheme_IOS和scheme_Adr这两个参数是app端给的呼起app url。

var ua = navigator.userAgent.toLowerCase();

        var t;

        var config = {

            /*scheme:必须*/

            scheme_IOS: 'lbbox1214151904://com.lababox',

            scheme_Adr: 'schemedemo://aa.com/test/scheme?name=google&page=1',

            download_url: document.getElementById('download-app').value,

            timeout: 600

        };

        function openclient() {

            var startTime = Date.now();

            var ifr = document.createElement('iframe');

            ifr.src = ua.indexOf('os') > 0 ? config.scheme_IOS : config.scheme_Adr;

            ifr.style.display = 'none';

            document.body.appendChild(ifr);

            var t = setTimeout(function() {

                var endTime = Date.now();

                if (!startTime || endTime - startTime < config.timeout + 200) {

                    window.location = config.download_url;

                } else {

                }

            }, config.timeout);

            window.onblur = function() {

                clearTimeout(t);

            }

        }

        window.addEventListener("DOMContentLoaded", function(){

            document.getElementById("call-app").addEventListener('click',

                openclient, false);

        }, false);