判断透过微信、支付宝还是百度钱包扫一扫进入的H5页面

判断通过微信、支付宝还是百度钱包扫一扫进入的H5页面
//判断是否是微信浏览器
var isWechat = false;
UA = navigator.userAgent.toLowerCase();
if (UA.match(/MicroMessenger/i) == "micromessenger") {
isWechat = true;
}
alert(isWechat);

//判断是否是支付宝扫一扫
var isAlipay = false;
if (UA.match(/alipayclient/i) == "alipayclient") {
isAlipay = true;
}
alert(isAlipay);

//判断是否是百度钱包扫一扫
var isBaiduwallet = false;
if (UA.match(/baiduwallet/i) == "baiduwallet") {
isBaiduwallet = true;
}
alert(isBaiduwallet);