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题目内容 (请给出正确答案)
单选题
toggle()表示()。
A

如果不存在类名就添加一个;否则,删除它

B

从元素的class属性中添加和清除一个类名

C

检测class属性中是否包含一个指定的类名

D

以上都不正确


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