.js
文件类型1：JScript Executable Script
文件说明：
Executable script written in JScript, Microsofts version of JavaScript打开.js文件
Mac OS
Windows
Windows-based script host (Wscript.exe)Linux
其它内容
.js
文件类型2：JavaScript File
文件说明：
Text file containing JavaScript code; used to execute JavaScript instructions in Web pages; may include functions that open and close windows, validate form fields, enable rollover images, or create drop-down menus.Referenced by Web pages that incorporate JavaScript functions; usually imported in the <head> section of the HTML.
打开.js文件
Mac OS
Adobe Dreamweaver CS5Bare Bones Software BBEdit
Run in a Web browser
用文本编辑器编辑
Windows
Adobe Dreamweaver CS5IntelliJ IDEA
Run in a Web browser
Edit with a text editor
Linux
来源：. js文件