JSFiddle - React, Tailwind, and code Playground

HTML

<!DOCTYPE html> 
<html>

<head>
    <script type="text/javascript">

		// 取得網址裡的參數 
		function GetUrlVar(VarName) 
		{
		  name = name.replace(/[\[]/, "\\\[").replace(/[\]]/, "\\\]");
		  var regexS = "[\\?&]" + VarName + "=([^&#]*)";
		  var regex = new RegExp(regexS);
		  var results = regex.exec(window.location.href);
		  if (results == null)
		   	 return "";
		  else
			 return results[1];
		}

		  
		  // 要先取得網址裡的路徑起點終點經緯度參數 
		  var X = decodeURIComponent(GetUrlVar('XXX'));
		  alert(X);
		
    </script>
</head> 

<body> 
</body>

</html>