0614-03.逻辑与运算符.html

<!DOCTYPE html>
<html>
<head>
	<title></title>
</head>
<body>
	<script type="text/javascript">
	function button1_onclick()
	{
		var isregisterd=true;
		var level=3;
		var blance=25;
		if ( isregisterd && ( level>=2 ) && ( blance>=30 ) )
		{
			alert("下载地址是：");
		}
		else
		{
			alert("sorry，请充值思密达！！");
		}
	}
	</script>
	点击下载本影片
	<input type="button" id="Button1" value="下载" onclick="return button1_onclick()">
</body>
</html>