JavaScript event handler (event listener)_javascript skills

We know that the interaction between JavaScript and HTML is achieved through events. An event is a certain action performed by the user or the browser itself, such as click, mouseover, load..., and the function that responds to the event is called an event processing function ( or event listener).

<title>event util test</title> <input type="button" value="click me" id="btn"> <a href="http://www.baidu.com"> </a>baidu
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If you need to introduce external Js, you need to refresh to execute ]