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This article mainly explains "how to understand js event delegation". The content of the article is simple and clear, and it is easy to learn and understand. Please follow the editor's train of thought to study and learn "how to understand js event delegation".

1. Each function is an object that takes up memory. The more objects in memory, the worse the performance. The way to solve the problem of too many events is to delegate events.

2, event delegation bubble, only specify an event handler, you can manage all events of a certain type.

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