清除子元素继承父元素鼠标移入移出事件

functioncontains(parentNode,childNode){
if(parentNode.contains){
returnparentNode!=childNode&&parentNode.contains(childNode);
}else{
return!!(parentNode.compareDocumentPosition(childNode)&16);
}
}

functioncheckHover(e,target){
if(getEvent(e).type=="mouseover"){
return!contains(target,getEvent(e).relatedTarget||getEvent(e).fromElement)&&!((getEvent(e).relatedTarget||getEvent(e).fromElement)===target);
}else{
return!contains(target,getEvent(e).relatedTarget||getEvent(e).toElement)&&!((getEvent(e).relatedTarget||getEvent(e).toElement)===target);
}
}functiongetEvent(e){
returne||window.event;
}