跨浏览器的 mouseenter mouseleave 以及 compareDocumentPosition的使用说明

            <div style="background-color:#123;width:50%;height:50%;position:relative;left:25%;top:25%" >
                <div style="background-color:#456;width:50%;height:50%;position:relative;left:25%;top:25%" >
                </div>
            </div>
        </div>
    </div>
</div>

 

js脚本:

 

 

    var dd = document.getElementById('dd')

    if (! +'v1') {//ie
        dd.onmouseenter = function() { alert(1); };
        dd.onmouseleave = function() { alert(2); };
    }
    else {//others
        dd.onmouseover = function(e) {
            var t = e.relatedTarget;
            var t2 = e.target;
            this == t2 && t && !(t.compareDocumentPosition(this) & 8) && alert(1);
        };
        dd.onmouseout = function(e) {
            var t = e.relatedTarget;
            var t2 = e.target;
            this == t2 && t && !(t.compareDocumentPosition(this) & 8) && alert(2);
        };
    }

大功告成!!!!!