jQuery 操作class的一些方法
- removeClass() 方法从被选元素移除一个或多个类。
语法：$(selector).removeClass(class) - addClass() 方法向被选元素添加一个或多个类。
该方法不会移除已存在的 class 属性，仅仅添加一个或多个 class 属性。
提示：如需添加多个类，请使用空格分隔类名。
语法：$(selector).addClass(class) - attr() 方法设置或返回被选元素的属性值。
根据该方法不同的参数，其工作方式也有所差异。
语法：$(selector).attr(attribute)
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