没有jQuery的可靠的"mouseenter"

Question

我一直在寻找各处,我似乎找不到可靠的mouseenter事件.

我发现最接近的是:没有JQuery的mouseenter

function contains(container, maybe) {
  return container.contains ? container.contains(maybe) : !!(container.compareDocumentPosition(maybe) & 16);
}

var _addEvent = window.addEventListener ? function (elem, type, method) {
  elem.addEventListener(type, method, false);
} : function (elem, type, method) {
  elem.attachEvent('on' + type, method);
};

var _removeEvent = window.removeEventListener ? function (elem, type, method) {
  elem.removeEventListener(type, method, false);
} : function (elem, type, method) {
  elem.detachEvent('on' + type, method);
};

function _mouseEnterLeave(elem, type, method) {
    var mouseEnter = type === 'mouseenter',
        ie = mouseEnter ? 'fromElement' : 'toElement',
        method2 = function (e) {
            e = e || window.event;
            var related = e.relatedTarget || e[ie];
            if ((elem === e.target || contains(elem, e.target)) &&
                !contains(elem, related)) {
                    method();
            }
        };
    type = mouseEnter ? 'mouseover' : 'mouseout';
    _addEvent(elem, type, method2);
    return method2;
}

唯一的问题是,当我运行它:

_mouseEnterLeave(ele, 'mouseenter', function(){
  console.log('test');
});

每次听众开火时,我都会立即执行40-47(每次不同)的执行.

我也尝试过Quirksmode:http://www.quirksmode.org/js/events_mouse.html#mouseenter

function doSomething(e) {
    if (!e) var e = window.event;
    var tg = (window.event) ? e.srcElement : e.target;
    if (tg.nodeName != 'DIV') return;
    var reltg = (e.relatedTarget) ? e.relatedTarget : e.toElement;
    while (reltg != tg && reltg.nodeName != 'BODY')
        reltg= reltg.parentNode
    if (reltg== tg) return;
    // Mouseout took place when mouse actually left layer
    // Handle event
}

然而,这个非常不可靠,不仅如此,它假设父/元素是一个DIV.这必须更具活力.这是一个库/脚本,所以我不能包含jQuery.

简而言之,我有一个隐藏的元素,直到鼠标移动.移动后,只要鼠标移动或鼠标悬停在元素本身上,它就会出现.更少的代码将是非常棒的,因为只有WebKit本身不支持,mouseenter并且从第一个示例获得大量代码只是为了支持Chrome用于小UI的事情感觉很浪费.

Answer 1

是否可以直接废弃mouseenter并使用mousemove？它负责在鼠标移动时显示它。要使其在直接悬停在元素上时保持可见，只需使用 CSS 即可。

#your_element {
    display: none;
}

#your_element:hover {
    display: block;
}