添加类：addClass
删除类：removeClass
判断类是否存在：hasClass
<!DOCTYPE html><html lang="en"><head> ???<meta charset="UTF-8"> ???<title>Title</title> ???<script src="jquery-1.11.1.js"></script> ???<style> ???????div { ???????????width: 100px; ???????????height: 100px; ???????????border: 1px solid #ccc; ???????????float: left; ???????} ???????.box1 { ???????????margin-right: 10px; ???????} ???????.box2 { ???????????margin-left: 10px; ???????} ???????.show { ???????????background-color: red; ???????} ???</style> ???<script src="jquery-1.11.1.js"></script> ???<script> ???????$(function () { ???????????$(".box2").addClass("show"); ???????????$(".box1").removeClass("show"); ???????????console.log($("box1").hasClass("show")); ???????}); ???</script></head><body><div class="box1"></div><div class="box2"></div></body></html>jQuery——类的添加与删除
原文地址：http://www.cnblogs.com/wuqiuxue/p/8032196.html