How to judge whether the h5 page is in WeChat or Alipay environment

	function isWxOrAli() {
      var ua = window.navigator.userAgent.toLowerCase();
      //判断是不是微信
      if (ua.match(/MicroMessenger/i) == "micromessenger") {
			alert('在微信里');
        return "微信";
      }
      //判断是不是支付宝
      if (ua.match(/AlipayClient/i) == "alipayclient") {
			alert('在支付宝里');
        return "支付宝";
      }
   }