微信浏览器验证1

let ua = window.navigator.userAgent.toLowerCase()
if (ua.match(/MicroMessenger/i) == 'micromessenger') {//判断微信
		console.log('微信浏览器');	    
}

 微信浏览器验证2

if (/MicroMessenger/.test(window.navigator.userAgent)) { 
	console.log('微信浏览器');
}

 支付宝浏览器验证

if (/AlipayClient/.test(window.navigator.userAgent)) {
	//判断是否是支付宝浏览器打开
	console.log('支付宝客户端');
}