复制代码 代码如下:

<script type="text/javascript">

// 说明：添加、移除、检测 className

function hasClass(element, className) {

var reg = new RegExp('(s|^)'+className+'(s|$)');

return element.className.match(reg);

}

function addClass(element, className) {

if (!this.hasClass(element, className))

{

element.className += " "+className;

}

}

function removeClass(element, className) {

if (hasClass(element, className)) {

var reg = new RegExp('(s|^)'+className+'(s|$)');

element.className = element.className.replace(reg,' ');

}

}

</script>