js的函数

<html>
	<head>
		<title>HTML示例</title>
		<style type="text/css">
		
		</style>
	</head>
	<body>
		<script type="text/javascript">
	/*	function test()
		{
			alert("aaaaaa");
		}
		test();*/
		function add1(a,b)
		{
			var c=a+b;
			//alert(c);
			return c;
		}
		alert(add1(2,3));
		
		</script>
	</body>
</html>
/********************************************************/
<html>
	<head>
		<title>HTML示例</title>
		<style type="text/css">
		
		</style>
	</head>
	<body>
		<script type="text/javascript">

		var add3=function(a,b)
		{
			var c=a+b;
			alert(c);
			
		}
		add3(2,3);
		
		</script>
	</body>
</html>