js之自定义鼠标右键菜单

自定义右键菜单

让原有的鼠标右键消失，自己定义鼠标右键菜单
<!DOCTYPE html>
<html>
	<head>
		<meta charset="UTF-8">
		<title></title>
		<style type="text/css">
			ul,li{
				list-style: none;
				padding: 0;
				margin: 0;
			}
			ul{
				display: none;
				position: absolute;
				background: cyan;
			}
			li{
				height: 20px;
				 50px;
				
			}
			li:hover{
				background: burlywood;
				cursor: pointer;
			}
		</style>
		<script type="text/javascript">
			window.onload=function(){
				document.oncontextmenu=function(ev){
					var clintX=ev.clientX;  //ev获取的只是屏幕可视范围的x,y值
					var clintY=ev.clientY;
					var scollTop=document.documentElement.scrollTop|| document.body.scrollTop;   //当有下拉条的时候必须加上当前屏幕不可视范围的left,和top值
					var scollLeft=document.documentElement.scrollLeft || document.body.scrollLeft
					document.getElementsByTagName('ul')[0].style.left=clintX+scollLeft+'px';
					document.getElementsByTagName('ul')[0].style.top=clintY+scollTop+'px';
					document.getElementsByTagName('ul')[0].style.display='block';
					return false;  //阻止鼠标右键菜单出现
				}
			}
		</script>
	</head>
	<body style="height: 2000px;">
		<ul>
			<li>复制</li>
			<li>粘贴</li>
			<li>全选</li>
			<li>删除</li>
		</ul>
	</body>
</html>