04（变量声明的注意事项）.html

<!DOCTYPE html>
<html>
	<head>
		<title>这是</title>
		<meta charset="utf-8"/>
		<script type="text/javascript">
		/*  1.变量不能以数字开头	
			var 120ss = "ss";*/
		/*2.——下划线,$和字母用法相同
			var _="小明";alert(_);  $ = "护花使者";alert($);  computer = "宏碁";alert(computer);*/
		/*3.js严格区分大小写
			var name = "小王"; alert(name);*/
		/*4.不能用特殊字命名，命名要有意义，看得懂*/	
		var name = "小明";
		</script>
		<script type="text/javascript">
			alert(name);
		</script>
	<body>
		
	</body>
</html>