The difference between JavaScript and jquery

1. JavaScript is a programming language that we use to write client-side browser scripts.
2. jquery is a library of JavaScript that contains several reusable functions to help us simplify JavaScript development
3. jquery can do javascipt can do, and JavaScript can do things, jquery does not necessarily do

Note: In general, it is a library file that will be thrown in the library to construct a function or object, and if it is a constructor, create an object with the New keyword, if the object calls properties and methods directly

Steps for DOM document loading

1. Parses the HTML structure.
2. Load external scripts and style sheet files.
3. Parse and execute the script code.
4. The DOM tree is built to completion.
5. Load external files such as pictures.
6. The page has finished loading.

Different execution times

Window.onload must wait until all the elements of the page that include the picture have been loaded before they can be executed.

$ (document). Ready () is executed when the DOM structure is drawn and does not have to wait for the load to complete.

Different number of writes

Window.onload cannot write multiple at the same time, if there are multiple window.onload methods, only one

$ (document). Ready () can be written multiple at the same time and can be executed

Simplify the wording differently

Window.onload No simplified notation

$ (document). Ready (function () {}) can be simply written as $ (function () {});

The difference between JavaScript and jquery