“Cannot read property 'classList' of null” when using classList.add

原因

没有 document.geyElementById('nonexisting') nonexisting 不存在

解决办法增加 nonexisting id属性

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“Cannot read property 'classList' of null” when using classList.add

“Cannot read property 'classList' of null” when using classList.add

“Cannot read property 'classList' of null” when using classList.add相关推荐

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