how to refresh page once in javascript code example

Example 1: how to refresh a web page automatically in javascript

<html>
   <head>
      
      <script type = "text/JavaScript">
         <!--
            function AutoRefresh( t ) {
               setTimeout("location.reload(true);", t);
            }
         //-->
      </script>
      
   </head>
   
   <body onload = "JavaScript:AutoRefresh(5000);">
      <p>This page will refresh every 5 seconds.</p>
   </body>
   
</html>

Example 2: javascript reload page one time

window.onload = function() {
	if(!window.location.hash) {
		window.location = window.location + '#loaded';
		window.location.reload();
	}
}

Example 3: javascript refresh page automatically

<meta http-equiv="refresh" content="30"/>