Determine the H5 page entered by scanning through WeChat, Alipay or Baidu Wallet

//Determine whether it is a WeChat browser
var isWechat = false;
UA = navigator.userAgent.toLowerCase();
if (UA.match(/MicroMessenger/i) == "micromessenger") {
isWechat = true;
}
alert(isWechat) ;

//To determine whether it is Alipay scan
var isAlipay = false;
if (UA.match(/alipayclient/i) == "alipayclient") {
isAlipay = true;
}
alert(isAlipay);

//To determine whether it is Baidu Wallet sweep
var isBaiduwallet = false;
if (UA.match(/baiduwallet/i) == "baiduwallet") {
isBaiduwallet = true;
}
alert(isBaiduwallet);