判断移动端，pc端, android终端, ios终端, 微信内

移动端，pc端访问

const router = /Android|webOS|iPhone|iPod|BlackBerry/i.test(navigator.userAgent) ? routeMobile : routerWeb

android终端,ios终端

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(isAndroid){
            alert("android");
        }else if(isiOS){
            alert("ios");
        }else{
        }
        

微信内置浏览器

var ua = window.navigator.userAgent.toLowerCase();
        if (ua.match(/MicroMessenger/i) == 'micromessenger') {
            alert("微信");
        } else {
            alert("非微信");
        }