扩展Jquery插件处理mouseover时内部有子元素时发生样式闪烁

$.containsNode = function(parentNode, childNode) { 
if (parentNode.contains) { 
return parentNode != childNode && parentNode.contains(childNode); 
} else { 
return !!(parentNode.compareDocumentPosition(childNode) & 16); 
} 
} 
$.fn.fhover = function(over, out) { 
this.hover(function(e) { 
if ($.containsNode(e.target, e.currentTarget)) { 
return; 
} 
over.call(this, e); 
}, function(e) { 
if ($.containsNode(e.target, e.currentTarget)) { 
return; 
} 
out.call(this, e); 
}); 
return this; 
}