JS实现自定义右键菜单

在灵图时做的，效果如下
Demo效果图
Demo源码如下
<!DOCTYPE html>
<html>
  <head>
    <title>JS实现自定义右键菜单</title>
    <meta http-equiv="content-type" content="text/html; charset=gbk">
    <script src="http://api.51ditu.com/js/ajax.js"></script>

	<style type="text/css">
		#container {
			text-align : center;
			width : 500px;
			height : 500px;
			border : 1px solid blue;
			margin : 0 auto;
			
		}
		.skin {
			width : 100px;
			border : 1px solid gray;
			padding : 2px;
			visibility : hidden;
			position : absolute;
		}
		div.menuitems {
			margin : 1px 0;
		}
		div.menuitems a {
			text-decoration : none;
		}
		div.menuitems:hover {
			background-color : #c0c0c0;
		}
	</style>
<script>		
window.onload = function() {
	
	var container = document.getElementById('container');	
	var menu = document.getElementById('menu');
	
	/*显示菜单*/
	function showMenu() {

		var evt = window.event || arguments[0];
		
		/*获取当前鼠标右键按下后的位置，据此定义菜单显示的位置*/
		var rightedge = container.clientWidth-evt.clientX;
		var bottomedge = container.clientHeight-evt.clientY;

		/*如果从鼠标位置到容器右边的空间小于菜单的宽度，就定位菜单的左坐标（Left）为当前鼠标位置向左一个菜单宽度*/
		if (rightedge < menu.offsetWidth) 				
			menu.style.left = container.scrollLeft + evt.clientX - menu.offsetWidth + "px";				
		else
		/*否则，就定位菜单的左坐标为当前鼠标位置*/
			menu.style.left = container.scrollLeft + evt.clientX + "px";
		
		/*如果从鼠标位置到容器下边的空间小于菜单的高度，就定位菜单的上坐标（Top）为当前鼠标位置向上一个菜单高度*/
		if (bottomedge < menu.offsetHeight)
			menu.style.top = container.scrollTop + evt.clientY - menu.offsetHeight + "px";
		else
		/*否则，就定位菜单的上坐标为当前鼠标位置*/
			menu.style.top = container.scrollTop + evt.clientY + "px";
			
		/*设置菜单可见*/
		menu.style.visibility = "visible";				
		LTEvent.addListener(menu,"contextmenu",LTEvent.cancelBubble);
	}
	/*隐藏菜单*/
	function hideMenu() {
		menu.style.visibility = 'hidden';
	}								
	LTEvent.addListener(container,"contextmenu",LTEvent.cancelBubble);
	LTEvent.addListener(container,"contextmenu",showMenu);
	LTEvent.addListener(document,"click",hideMenu);						
}
	
</script>
  </head>
  
  <body>
	
	<div id="menu" class="skin">
		<div class="menuitems">
			<a href="javascript:history.back();">后退</a>
		</div>
		<div class="menuitems">
			<a href="javascript:history.back();">前进</a>
		</div>
		<hr>
		<div class="menuitems">
			<a href="http://api.51ditu.com/" target="_blank">地图api</a>
		</div>
		<div class="menuitems">
			<a href="http://www.51ditu.com/traffic/index.html" target="_blank">实时交通</a>
		</div>
		<div class="menuitems">
			<a href="http://www.51ditu.com" target="_blank">地图搜索</a>
		</div>
		<div class="menuitems">
			<a href="http://nav.51ditu.com" target="_blank">驾驶导航</a>
		</div>
		<hr>
		<div class="menuitems">
			<a href="http://uu.51ditu.com" target="_blank">灵图UU</a>
		</div>
		<div class="menuitems">
			<a href="http://lushu.51ditu.com" target="_blank">路书下载</a>
		</div>
		<hr>
		<div class="menuitems">
			<a href="http://www.lingtu.com" target="_blank">关于本站</a>
		</div>
		<div class="menuitems">
			<a href="http://emap.51ditu.com/link/link.html" target="_bland">友情链接</a>
		</div>
	</div>
	
	<div id="container">		
		<p>右键此区域</p>
	</div>
  </body>
</html>