QETHAN · May 20, 2013 09:39
diff --git a/js变量声明位置解释 b/js变量声明位置解释
 <html>
  <head>
 		<script type="text/javascript">
 			alert(h);//function.....
 			alert(a);//undefined

 			var a = 3;
 			function h() {
 				alert('22');
 			}
 		</script>
 	</head>
 </html>

 js代码解释器会爸函数声明放在顶部，普通变量声明按照代码所在位置解释
	<html>
	<head>
	<script type="text/javascript">
	alert(h);//function.....
	alert(a);//undefined

	var a = 3;
	function h() {
	alert('22');
	}
	</script>
	</head>
	</html>

	js代码解释器会爸函数声明放在顶部，普通变量声明按照代码所在位置解释