<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title></title>
<style type="text/css">
#menu {
height: 200px;
width: 50px;
border: 1px solid gray;
background-color: antiquewhite;
padding: 10px;
display: none;
position: absolute;
}
ul,
li {
margin: 0;
padding: 0;
list-style-type: none;
line-height: 40px;
}
</style>
</head>
<body>
<div id="menu">
<ul>
<li>复制</li>
<li>粘贴</li>
<li>运行</li>
<li>工具</li>
<li>帮助</li>
</ul>
</div>
</body>
<script type="text/javascript">
var menu = document.getElementById("menu");
document.oncontextmenu = function(ev) {
var oEvent = ev || event;
//自定义的菜单显示
menu.style.display = "block";
//让自定义菜单随鼠标的箭头位置移动
menu.style.left = oEvent.clientX + "px";
menu.style.top = oEvent.clientY + "px";
//return false阻止系统自带的菜单，
//return false必须写在最后，否则自定义的右键菜单也不会出现
return false;
}
//实现点击document，自定义菜单消失
document.onclick = function() {
menu.style.display = "none";
}
</script>
</html>
原文：http://www.cnblogs.com/niuniudashijie/p/6127617.html