jquery achieve the drop-down

Click on the drop-down and use jQuery to achieve the hidden menu
specific effect is as follows:

Click on the drop-down menu when open, while closing others have opened drop-down menu, and click again to close the drop-down menu;
Here is the code section:

<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8" />
		<title></title>
		<style type="text/css">
			* {
				margin: 0;
				padding: 0;
				list-style: none;
			}

			.list {
				width: 300px;
				border: 1px solid black;
			}

			.at the {
				width: 100%;
				height: 40px;
				background-color: yellow;
				border-bottom: 1px solid black;
				color: black;
				font-size: 20px;
				cursor: pointer;
			}

			.li: hover {
				color: red;
			}

			.else {
				width: 100%;
				display: none;
			}

			.else-list {
				width: 100%;
				height: 40px;
				background-color: white;
				border: 1px solid black;
				border-left: none;
				border-right: none;
				text-align: center;
				font-size: 20px;
				color: black;

			}

			.else-list:hover {
				color: white;
				background-color: blue;
			}

			.last {
				border-bottom: none;
			}

			.first {
				border-top: none;
			}
		</style>
	</head>
	<body>
		<ul class="list">
			<li>
				<div class="li">
					News Center
				</div>
				<div class="else">
					<Div class = "else-list first"> Add news </ div>
					<Div class = "else-list"> Add news </ div>
					<Div class = "else-list"> Add news </ div>
					<Div class = "else-list"> Add news </ div>
				</div>
			</li>
			<li>
				<div class="li">
					about us
				</div>
				<div class="else">
					<Div class = "else-list first"> Add news </ div>
					<Div class = "else-list"> Add news </ div>
					<Div class = "else-list"> Add news </ div>
					<Div class = "else-list"> Add news </ div>
				</div>
			</li>
			<li>
				<div class="li">
					Business Contacts
				</div>
				<div class="else">
					<Div class = "else-list first"> Add news </ div>
					<Div class = "else-list"> Add news </ div>
					<Div class = "else-list"> Add news </ div>
					<Div class = "else-list"> Add news </ div>
				</div>
			</li>
			<li class="last">
				<div class="li">
					contact us
				</div>
				<div class="else">
					<Div class = "else-list first"> Add news </ div>
					<Div class = "else-list"> Add news </ div>
					<Div class = "else-list"> Add news </ div>
					<Div class = "else-list"> Add news </ div>
				</div>
			</li>
		</ul>
		<script src="js/jquery-1.11.1.min.js" type="text/javascript" charset="utf-8"></script>
		<script type="text/javascript">
			$(function() {
				. $ ( '. List') find ( 'li: first-child') children ( 'else.') Show (); // first line of the default display.
				$(".list > li").on("click", ".li", function() {
					$(this).next('.else').slideToggle(500);
					$(this).parent().siblings().children('.else').slideUp(500);
					$("html,body").animate({
						scrollTop: 0
					}, 500); 
				});
			});
		</script>
	</body>
</html>

jquery achieve the drop-down

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