火狐浏览器兼容右键菜单的问题

 注意： var clickID = event.target.id|| event.srcElement.id+"";

//自定义菜单

  

document.oncontextmenu = function (event)

{

  event = event || window.event;     

var clickID = event.target.id|| event.srcElement.id+"";
var style = oMenu.style;
style.top = event.clientY + "px";

style.left = event.clientX + "px";

.....................

        };
//页面点击后自定义菜单消失
document.onclick = function ()
{
oMenu.style.display = "none"
}