Basic JavaScript Tutorial (ii)

First, JavaScript syntax

1.JavaScript statement: A command issued by a JavaScript statement to the browser. The purpose of the statement is to tell the browser what to do.

2. Semicolon: Split between statements with semicolons. Semicolons are optional and can not be added. Suggested Plus.

3.JavaScript code: Executes sequentially in the order in which they are written.

4. Identifier: The JavaScript identifier must start with a letter, underscore, or dollar sign. The JS keyword cannot be used (such as document).

5.JS is case sensitive.

6. Adding spaces does not affect execution.

7. Code wrapping: Do not break lines between the letters of the Code

8. Reserved words: Attention when using

<! Doctype html>
<! DOCTYPE html>

Second, JavaScript comments
 1. Single-line comment//
2. Multi-line Comment/**/
<! DOCTYPE html>

 JavaScript Basics Tutorial (ii)