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

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