<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>无标题文档</title>
</head>
<body>
<div id = "test" style = "250px;height:100px;">
sssssssssssss
</div>
<input type = "button" value = "toggleClassTest" onclick = "toggleClassTest();" />
</body>
</html>
<style type="text/css">
div.testClass{
background-color:gray;
}
</style>
<script type="text/javascript">
function hasClass(obj, cls) {
return obj.className.match(new RegExp('(\s|^)' + cls + '(\s|$)'));
}
function addClass(obj, cls) {
if (!this.hasClass(obj, cls)) obj.className += " " + cls;
}
function removeClass(obj, cls) {
if (hasClass(obj, cls)) {
var reg = new RegExp('(\s|^)' + cls + '(\s|$)');
obj.className = obj.className.replace(reg, ' ');
}
}
function toggleClass(obj,cls){
if(hasClass(obj,cls)){
removeClass(obj, cls);
}else{
addClass(obj, cls);
}
}
function toggleClassTest(){
var obj = document. getElementById('test');
toggleClass(obj,"testClass");
}
</script>