JS判断是否是微信页面，判断手机操作系统（ios或android）并跳转到不同下载页面

function is_weixin() {
var ua = window.navigator.userAgent.toLowerCase();
if (ua.match(/MicroMessenger/i) == 'micromessenger') {
return true;
} else {
return false;
}
}

$(function () {
var u = navigator.userAgent, app = navigator.appVersion;
var isAndroid = u.indexOf('Android') > -1 || u.indexOf('Linux') > -1; //g
var isIOS = !!u.match(/\(i[^;]+;( U;)? CPU.+Mac OS X/); //ios终端
if (isAndroid) {
window.location.href = 'appDownload.html';
}
if (isIOS) {
window.location.href = 'iosDownload.html';
}
});

function IsPC() {
var userAgentInfo = navigator.userAgent;
var Agents = ["Android", "iPhone",
"SymbianOS", "Windows Phone",
"iPad", "iPod"];
var flag = true;
for (var v = 0; v < Agents.length; v++) {
if (userAgentInfo.indexOf(Agents[v]) > 0) {
flag = false;
break;
}
}
return flag;
}