js阻止冒泡

(ev || event).cancelBubble = true;

 

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<script type="text/javascript">

 

    window.onload = function () {

 

        var oUl = document.getElementById('ul_menu');

        var oLi = getByClass(oUl, 'item');

        var sonUl = getByClass(oUl, 'son');

 

        for (var i = 0; i < oLi.length; i++) {

            oLi[i].index = i;

            oLi[i].onclick = function (ev) {

                for (var n = 0; n < oLi.length; n++) oLi[n].className = "";

                this.className = "current";

                for (var n = 0; n < sonUl.length; n++) sonUl[n].style.display = "none";

                sonUl[this.index].style.display = "block";

 

                (ev || event).cancelBubble = true;

            }

 

        }

 

        document.onclick = function () {

            for (var n = 0; n < oLi.length; n++) oLi[n].className = "";

            for (var n = 0; n < sonUl.length; n++) sonUl[n].style.display = "none";

        }

 

    }

 

 

    function getByClass(oParent, sClass) {

        var aEle = oParent.getElementsByTagName('*');

        var aResult = [];

        var re = new RegExp('\\b' + sClass + '\\b', 'i');

        var i = 0;

 

        for (i = 0; i < aEle.length; i++) {

            //if(aEle[i].className==sClass)

            //if(aEle[i].className.search(sClass)!=-1)

            if (re.test(aEle[i].className)) {

                aResult.push(aEle[i]);

            }

        }

 

        return aResult;

    }

 

 

</script>