One of the series of introductory JavaScript courses_Basic knowledge

1. What is JavaScript?
1. JavaScript is a scripting language that is interpreted and executed
2. JavaScript is a programming language that can be used to add interactivity to web pages
3. JavaScript is not Java. JavaScript was developed by Netscape, while Java was developed by Sun
2. JavaScript development tools
In a sense, any text editing software can write JavaScript code. It is recommended to use Aptana IDE development tools on the windows platform. Of course, you can simply search for more development tools to get more results! If you are using the mac platform, it is recommended to use TextWrangler developed by Bare Bones Software Company
3. Notes on JavaScript
1. Case sensitivity
2. Spaces and line breaks: spaces are in the code will be ignored, all letters of the same identifier must be consecutive. A line of code can be written in multiple lines, but this is not the case for strings. To split a string into multiple lines, treat each line as a separate string, and then use the " " operator to connect strings located on different lines.
3. Semicolon is optional, but it is recommended to use semicolon to distinguish
4. JavaScript program demonstration

<meta http-equiv="Content-Type" content="text/html; charset=gb2312"> <title>The first JavaScript program</title>