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JavaScript Basics Study Notes_Basic Knowledge

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Release： 2016-05-16 16:29:41
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Introduction to JavaScript

1. Definition : JavaScript is a scripting language that requires a host file, and its host file is an html file.

JavaScript is a lightweight programming language.

JavaScript is programming code that can be inserted into HTML pages.

JavaScript, when inserted into an HTML page, can be executed by all modern browsers.

2. Usage :

has three positions in html:
1) Inside the head;
2) Inside the body;
3) After , it is usually written after for the sake of safety. .

1. Write html output

2. Respond to events

3. Find elements and change content/style

4. Define a variable group - equivalent to a structure (a collection of variables) in C#

<script>The code can be written in <head> or after </html>. But the connection <input> submitted by the button must be written in <body>. </p> <p><img alt="" src="http://files.jb51.net/file_images/article/201412/2014120209122911.png"></p> <p>5. How to call external JS</p> <p>Click "File"--New "JavaScript"--"Create". Write operations, functions, etc. in the newly created "JavaScript" and call them in html. </p> <p>Format: <script src="path.JS "></script>

Create a new external file with the suffix Js.

Reference external Js in the host file html

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