javascript 兼容FF的onmouseenter和onmouseleave的代码

Caroline ·

更新时间:2024-11-14

· 843 次阅读

IE下有 onmouseenter和onmouseleave来解决。
可惜ff就没有。  我再想，为什么这么好的功能，为什么ff不引用呢？
还有ie中的onpropertychange  ，哎，ff中都没有。。。
对比例子中引入了一段js ，来兼容FF的onmouseenter和onmouseleave. ：
代码如下:
var xb =
{
    evtHash: [],
    ieGetUniqueID: function(_elem)
    {
        if (_elem === window) { return 'theWindow'; }
        else if (_elem === document) { return 'theDocument'; }
        else { return _elem.uniqueID; }
    },
    addEvent: function(_elem, _evtName, _fn, _useCapture)
    {
        if (typeof _elem.addEventListener != 'undefined')
        {
            if (_evtName == 'mouseenter')
                { _elem.addEventListener('mouseover', xb.mouseEnter(_fn), _useCapture); }
            else if (_evtName == 'mouseleave')
                { _elem.addEventListener('mouseout', xb.mouseEnter(_fn), _useCapture); }
            else
                { _elem.addEventListener(_evtName, _fn, _useCapture); }
        }
        else if (typeof _elem.attachEvent != 'undefined')
        {
            var key = '{FNKEY::obj_' + xb.ieGetUniqueID(_elem) + '::evt_' + _evtName + '::fn_' + _fn + '}';
            var f = xb.evtHash[key];
            if (typeof f != 'undefined')
                { return; }
            f = function()
            {
                _fn.call(_elem);
            };
            xb.evtHash[key] = f;
            _elem.attachEvent('on' + _evtName, f);
            // attach unload event to the window to clean up possibly IE memory leaks
            window.attachEvent('onunload', function()
& nbsp;           {
                _elem.detachEvent('on' + _evtName, f);
            });
            key = null;
            //f = null;   /* DON'T null this out, or we won't be able to detach it */
        }
        else
            { _elem['on' + _evtName] = _fn; }
    },
    removeEvent: function(_elem, _evtName, _fn, _useCapture)
    {
        if (typeof _elem.removeEventListener != 'undefined')
            { _elem.removeEventListener(_evtName, _fn, _useCapture); }
        else if (typeof _elem.detachEvent != 'undefined')
        {
            var key = '{FNKEY::obj_' + xb.ieGetUniqueID(_elem) + '::evt' + _evtName + '::fn_' + _fn + '}';
            var f = xb.evtHash[key];
            if (typeof f != 'undefined')
            {
                _elem.detachEvent('on' + _evtName, f);
                delete xb.evtHash[key];
            }
            key = null;
            //f = null;   /* DON'T null this out, or we won't be able to detach it */
        }
    },
    mouseEnter: function(_pFn)
    {
        return function(_evt)
        {
            var relTarget = _evt.relatedTarget;
            if (this == relTarget || xb.isAChildOf(this, relTarget))
                { return; }
            _pFn.call(this, _evt);
        }
    },
    isAChildOf: function(_parent, _child)
    {
        if (_parent == _child) { return false };
        while (_child && _child != _parent)
            { _child = _child.parentNode; }
        return _child == _parent;
    }
};
本篇文章来源于 cssrain.cn 原文链接：http://www.cssrain.cn/article.asp?id=952

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