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並前往https://medium.com/@prasannavaidya/how-to-detect-changes-to-the-dom-elements-classes-using-mutationobserver-javascript-e8e8cf09cd85

How to detect changes to the DOM element's classes using ...

Then, store a flag of whether a particular class is in the classList of the element as the previous class state. MutationObserver has mutations as a ...

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