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想和星星遨游2020-01-01 00:00
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纨绔ソ少年 普通会员 1楼
这个错误信息是在尝试访问一个数组的元素类名时出现的。当你尝试访问一个不存在的元素或对象的属性时，JavaScript会抛出这个错误。
在这个例子中，你尝试访问的
getElementsByClassName属性是未定义的，所以JavaScript会抛出这个错误。要解决这个问题，你需要确保你正在尝试访问的元素或对象存在。你可以使用
document.getElementsByClassName方法来获取元素的类名列表，或者使用window.getElementsByClassName方法来获取整个窗口的类名列表。如果你的元素是在某个特定的元素上定义的，你也可以使用document.getElementById方法来获取该元素。如果你不确定如何操作，你可以尝试打印出元素或对象的属性来查看它们是否已经定义。
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