ua判断页面在什么终端/系统打开

function isIOS() {
    return /ios|iPhone|iPad/ig.test(window.navigator.userAgent);
}



function isAndroid() {
    return /android/ig.test(window.navigator.userAgent);
}




function isWeiXin() {
    return /MicroMessenger/ig.test(window.navigator.userAgent);
}

        var ua = window.navigator.userAgent.toLowerCase();
        if(ua.match(/micromessenger/i)=="micromessenger") { 
            alert('wx');  //在微信打开
        }else if(ua.match(/qq/i)=="qq"){
            alert('qq');   //在QQ打开
        }else {
            alert('browser');  //浏览器
        }