EventUtil.addHandler(window,"load",function(event){var div=document.getElementById("mydiv");//禁止右键默认行为EventUtil.addHandler(div,"contextmenu",function(event){var event=EventUtil.getEvent(event);EventUtil.preventDefault(event);//为右键菜单添加CSS属性var menu=document.getElementById("myList");menu.style.listStyle="none";menu.style.margin=0;menu.style.padding=0;menu.style.width="80px";menu.style.fontSize="14px";menu.style.textAlign="center";menu.style.left=event.clientX+"px";menu.style.top=event.clientY+"px";menu.style.visibility="visible";var list=menu.children;for(var i=0,len=list.length;i<len;i++){list[i].style.marginTop="5px";}});//点击文档任意部位，关闭自定义右键菜单EventUtil.addHandler(document,"click",function(event){document.getElementById("myList").style.visibility="hidden";});});

<div id="container"><div id="mydiv">右键菜单</div><ul id="myList" style="position:absolute;visibility:hidden;background-color:silver"><li><a href="www.baidu.com">百度</a></li><li>菜单 2 </li><li>菜单 3 </li><li>菜单 4 </li><li>菜单 5 </li></ul>
</div>