方法一（网页上判断）
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 = "要跳转的页面URL";
} else {
window.close();
}
},
25);
} else if (navigator.userAgent.match(/android/i)) {
var state = null;
try {
} catch(e) {}
if (state) {
window.close();
} else {
window.location = "要跳转的页面URL";
}
}
方法二
function testApp(url) {
var timeout, t = 1000, hasApp = true;
setTimeout(function () {
if (hasApp) {
alert('安装了app');
} else {
alert('未安装app');
}
document.body.removeChild(ifr);
}, 2000)
var t1 = Date.now();
var ifr = document.createElement("iframe");
ifr.setAttribute('src', url);
ifr.setAttribute('style', 'display:none');
document.body.appendChild(ifr);
timeout = setTimeout(function () {
var t2 = Date.now();
if (!t1 || t2 - t1 < t + 100) {
hasApp = false;
}
}, t);
} 方法三（APP里判断）
var isAndroid = u.indexOf('Android') > -1 || u.indexOf('Linux') > -1; //android终端或者uc浏览器
var isiOS = !!u.match(/\(i[^;]+;( U;)? CPU.+Mac OS X/); //ios终端
if(isAndroid){
function android(){
window.setTimeout(function(){
},2000);
};
if(isiOS){
function ios(){
var ifr = document.createElement("iframe");
ifr.style.display = "none";
document.body.appendChild(ifr);
window.setTimeout(function(){
document.body.removeChild(ifr);
},2000)
};
}