常用基础js求教..

HTML code

<style><style>a{ width:100px; height:100px; background:#CCC;}.bb{ width:100px; height:100px; background:#666}</style><div><a href="#">2</a><a href="#">3</a><a href="#">5</a></div>点击2,给2附加样式aa,其他都不变,点击3,给3附加样式aa,其它回复默认样式.

HTML code

<style><style>a{ width:100px; height:100px; background:#CCC;}.bb{ width:100px; height:100px; background:#666}</style><div id="dv"><a href="#">2</a><a href="#">3</a><a href="#">5</a></div><script type="text/javascript">    window.onload = function () {        var as = document.getElementById('dv').getElementsByTagName('a');        for (var i = 0, j = as.length; i < j; i++)            //as[i].onclick = function () {//修改事件就好了            as[i].onmouseover = function () {                for (var i = 0, j = as.length; i < j; i++) as[i].className = '';                this.className = 'bb';            }    }</script>