Use $ (document). ready () in jquery to use _ jquery

This article focuses on $ (document) in jquery ). the ready () method is described in detail. If you need it, you can refer to it and hope to help you with window. onload = function () {alert ("welcome ");}
This method is used to automatically execute the js Code (function) after loading the page ).

$ (Document). ready (function () {...}) is used to replace window. onload;

Document. ready () and traditional methodsSimilarly, the onload () method occurs only after the page is loaded. This includes loading of DOM elements and other page elements (example). Therefore, document is used. the ready () method is faster than the onload () method.

Javascript can perform an operation on a DOM element only after it is defined. jQuery uses document. ready to ensure that the code to be executed is executed when the DOM element is loaded.

For example:

The Code is as follows: