What is the use of the unload event in js
This article will explain in detail what is the use of the unload event in js. The editor thinks it is very practical, so I share it for you as a reference. I hope you can get something after reading this article.
1. Corresponding to the load event, it is triggered when the document is completely unloaded. As long as the user switches from one page to another, the unload event will occur.
2. The most common event is to clear references to avoid memory leaks.
There are two ways to specify unload event handlers, the first using JavaScript. The second adds a feature to the body element.
Example
/ * the first method * / EventUtil.addHandler (window, "unload", function (event) {/ / perform corresponding operations}) / * the second method * /
