网页端运行在app内置浏览器判断

1.是否运行在微信浏览器

/* 是否为微信浏览器 */
isWechat() {
    var ua = window.navigator.userAgent.toLowerCase();
    if (ua.match(/micromessenger/i) == 'micromessenger') {
        return true;
    } else {
        return false;
    }
}

2.是否运行在支付宝浏览器

/* 是否为支付宝浏览器 */
isAlipay() {
    var ua = window.navigator.userAgent.toLowerCase();
    if (userAgent.match(/Alipay/i) == "alipay") {
        return true;
    } else {
        return false;
    }
}

3.JS判断客户端是手机还是PC

        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;
        }