单选题contains（）方法表示（）。A检测class属性中是否包含一个指定的类名B如果不存在类名就添加一个；否则，删除它C从元素的class属性中添加和清除一个类名D以上都不正确
单选题
contains（）方法表示（）。
A
检测class属性中是否包含一个指定的类名
B
如果不存在类名就添加一个；否则，删除它
C
从元素的class属性中添加和清除一个类名
D
以上都不正确
参考解析
解析：
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