因为我不能评论，所以我将写这作为一个答案!

请理解css选择器“:hover”和hover事件之间的区别!

":hover"是一个css选择器，当像这样使用$("#elementId").is(":hover")时，它确实与事件一起被删除了，但它的意思是它真的与jQuery事件无关。

如果你输入$("#elementId:hover")，元素只会在你用鼠标悬停时被选中。上面的语句将适用于所有jQuery版本，因为你选择这个元素与纯合法的css选择。

另一方面，事件悬停

$("#elementId").hover(
     function() { 
         doSomething(); 
     }
); 

在jQuery 1.8的时候已经被弃用了。

When the event name "hover" is used, the event subsystem converts it to "mouseenter mouseleave" in the event string. This is annoying for several reasons: Semantics: Hovering is not the same as the mouse entering and leaving an element, it implies some amount of deceleration or delay before firing. Event name: The event.type returned by the attached handler is not hover, but either mouseenter or mouseleave. No other event does this. Co-opting the "hover" name: It is not possible to attach an event with the name "hover" and fire it using .trigger("hover"). The docs already call this name "strongly discouraged for new code", I'd like to deprecate it officially for 1.8 and eventually remove it.

为什么他们删除用法是(":hover")不清楚，但哦，好吧，你仍然可以像上面那样使用它，这里有一个小技巧，仍然使用它。

(function ($) {
   /** 
    * :hover selector was removed from jQuery 1.8+ and cannot be used with .is(":hover") 
    * but using it in this way it works as :hover is css selector! 
    *
    **/
    $.fn.isMouseOver = function() {
        return $(this).parent().find($(this).selector + ":hover").length > 0;
    };
})(jQuery);

哦，我不建议使用超时版本，因为这带来了很多复杂性，如果没有其他方法，请使用超时功能，相信我，在95%的情况下有另一种方法!

希望我能帮到一些人。

Greetz安迪

You can test with jQuery if any child div has a certain class. Then by applying that class when you mouse over and out out a certain div, you can test whether your mouse is over it, even when you mouse over a different element on the page Much less code this way. I used this because I had spaces between divs in a pop-up, and I only wanted to close the pop up when I moved off of the pop up, not when I was moving my mouse over the spaces in the pop up. So I called a mouseover function on the content div (which the pop up was over), but it would only trigger the close function when I moused-over the content div, AND was outside the pop up!

$(".pop-up").mouseover(function(e)
    {
    $(this).addClass("over");
    });

$(".pop-up").mouseout(function(e)
    {
    $(this).removeClass("over");
    });


$("#mainContent").mouseover(function(e){
            if (!$(".expanded").hasClass("over")) {
            Drupal.dhtmlMenu.toggleMenu($(".expanded"));
        }
    });

我结合了这个主题的想法，想出了这个，这对于显示/隐藏子菜单很有用:

$("#menu_item_a").mouseenter(function(){
   clearTimeout($(this).data('timeoutId'));
   $("#submenu_a").fadeIn("fast");
}).mouseleave(function(){
   var menu_item = $(this);

   var timeoutId = setTimeout(function(){
      if($('#submenu_a').is(':hover'))
      {
        clearTimeout(menu_item.data('timeoutId'));
      }
      else
      {
        $("#submenu_a").fadeOut("fast");
      }
   }, 650);

    menu_item.data('timeoutId', timeoutId); 
});

 $("#submenu_a").mouseleave(function(){
   $(this).fadeOut("fast");
 });

似乎对我有用。希望这能帮助到一些人。

编辑:现在意识到这种方法在IE中不能正确工作。

你可以使用jQuery的mouseenter和mouseleave事件。您可以在鼠标进入所需区域时设置标志，并在鼠标离开该区域时取消设置标志。

我需要的东西正是这样的(在一个更复杂的环境和解决方案有很多'mouseenter '和'mouseleaves'没有正常工作)，所以我创建了一个小jquery插件，添加方法ismouseover。到目前为止，它运行得很好。

//jQuery ismouseover  method
(function($){ 
    $.mlp = {x:0,y:0}; // Mouse Last Position
    function documentHandler(){
        var $current = this === document ? $(this) : $(this).contents();
        $current.mousemove(function(e){jQuery.mlp = {x:e.pageX,y:e.pageY}});
        $current.find("iframe").load(documentHandler);
    }
    $(documentHandler);
    $.fn.ismouseover = function(overThis) {  
        var result = false;
        this.eq(0).each(function() {  
                var $current = $(this).is("iframe") ? $(this).contents().find("body") : $(this);
                var offset = $current.offset();             
                result =    offset.left<=$.mlp.x && offset.left + $current.outerWidth() > $.mlp.x &&
                            offset.top<=$.mlp.y && offset.top + $current.outerHeight() > $.mlp.y;
        });  
        return result;
    };  
})(jQuery);

然后在文档的任何地方像这样调用它，它会返回true或false:

$("#player").ismouseover()

我在IE7+、Chrome 1+和Firefox 4上进行了测试，运行正常。

我采纳了SLaks的想法，并将其整合到一个小班中。

function HoverWatcher(selector){
  this.hovering = false;
  var self = this; 

  this.isHoveringOver = function() { 
    return self.hovering; 
  } 

    $(selector).hover(function() { 
      self.hovering = true; 
    }, function() { 
      self.hovering = false; 
    }) 
} 

var box1Watcher = new HoverWatcher('#box1');
var box2Watcher = new HoverWatcher('#box2');



$('#container').click(function() {
  alert("box1.hover = " + box1Watcher.isHoveringOver() +
        ", box2.hover = " + box2Watcher.isHoveringOver());
});