JavaScript Basics Learn Notes _ basics

Introduction to JavaScript

definition : JavaScript is a scripting language, requires a host file, and its host file is an HTML file.

JavaScript is a lightweight programming language.

JavaScript is a programming code that can be inserted into an HTML page.

JavaScript is inserted into an HTML page and can be executed by all modern browsers.

Second, use :

There are three blocks in the HTML position:
1) head inside;
2) body inside;
3 after

1. Write HTML output

2. Responding to Events

3, find the elements, change the content/style

4. Define variable groups--equivalent to a struct in C # (a set of variables)

<script> code can be written in

5, how to call the external JS

Use "File"--new "JavaScript"--"create". Write operations, functions, and so on in the new "JavaScript" by calling in HTML.

Format: <script src= "path. JS "></script>

Create a new file with JS suffix on the outside.

Referencing external JS in host file html