利用
//If clicked element id is not contents
if(event.target.id !== 'contents') {
alert("..");
}
编辑 - 如果结构是您的评论使用的结构:
if($(event.target).closest('div#contents').length === 0){
alert('there is no div with id === "contents" in the ancestors of the clicked li');
}
编辑 2 - 我的代码的解释。如果你有这个标记
<div id="contents"><ul><li>Item1</li><li>Item2</li></ul></div>
这段代码意味着
//event.target is a DOM element, so wrap it into a jQuery object
$(event.target)
.closest('div#contents')//find a div element going up the dom tree.
//This method returns a jQuery collection that it's
//empty if the div is not found
.length //the collection has a length
//property that is equal to the number of found elements