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

DOM level and DOM event

DOM level can be divided into four levels: DOM0 level, DOM1 level, DOM2 level and DOM3 level, while DOM events are divided into three levels: DOM0 level event processing, DOM2 level event processing and DOM3 level event processing. As shown in the following figure:

One might ask, why is there no DOM1-level event handling? Because there is no event-related content defined in the level 1 DOM standard, there is no so-called level 1 DOM event model.

The DOM level is not described in detail here, but the following is mainly about the different events in different levels of DOM.

1.DOM0 level event

Before we learn about DOM0-level events, it is necessary to take a look at the HTML event handler, which is also the earliest way of handling this kind of event, as follows:

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