Multiple methods and differences between jquery and js initialization loading _ jquery

Jquery waits for the page to load data and some page elements. js performs initialization loading only after the page is fully loaded. For more information, see the differences between jquery and js initialization loading pages:
Jquery: Wait for the page to load data and some page elements (excluding images and videos ),

Js: initialization and loading are performed only after all pages are loaded.

1. There are three methods for loading and initializing jQuery pages. scripts are executed when pages are loaded,

First (more common ):

The Code is as follows:

$. Function (){
Alert ("method 1 ");
});

Second:

The Code is as follows:

$ (Document). ready (function (){
Alert ("method 2 ");
});

Third:

The Code is as follows:

JQuery (function ($ ){
Alert ("method 3 ");
});

2. js initialization Loading Method
First:

The Code is as follows:

Window. onload = function (){
Alert ("initialization and loading ");
};

Second:
(WinOnload: custom method name)

The Code is as follows:

Function winOnload (){
Alert ("initialization and loading ");
};
WinOnload ();

Note: Because jquery uses the $ symbol, it conflicts with some components such as dwr. To solve this problem, you can use

The Code is as follows:

Var ace = jQuery. noConflict ();