html - JavaScript- cannot change style when my script in head -


i'm trying javascript work when insert script head or body elements.

here examples:

firstly insert body this example (working):

    <html>      <body>            <p id="p2">hello world!</p>            <script>      document.getelementbyid("p2").style.color = "blue";      </script>            <p>the paragraph above changed script.</p>            </body>      </html>

when move script end of body (also working):

<html>  <body>    <p id="p2">hello world!</p>    <p>the paragraph above changed script.</p>    <script>  document.getelementbyid("p2").style.color = "blue";  </script>  </body>  </html>

but when move head stops working:

	<html>  	<head>  		<script>  		document.getelementbyid("p2").style.color = "blue";  		</script>  	</head>  	<body>    	<p id="p2">hello world!</p>    	<p>the paragraph above changed script.</p>    	</body>  	</html>

you can use window.onload means invoke after html page loaded. here quick reference study . thank you!


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