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>