Javascript debug
<< Testing
methods / functions
- alert() Method: Window alert() Method
- Is there an equivalent for var_dump (PHP) in Javascript? - Stack Overflow
- isNaN() Function, isFinite() Function, typeof variable
tools
- The Online Lint
- JSLint,The JavaScript Code Quality Tool
- desktop editor: Sublime Text + package: JSLint[1]
- JS Bin - Collaborative JavaScript Debugging
allow to download - console.log for Firefox
& Chrome 
not IE 
- Firebug and Logging : Firebug, 利用Firebug的console功能作JavaScript偵錯 - iT邦幫忙::IT知識分享社群 for Firefox not work for the Firebug Lite for Google Chrome(tested version: 1.4.0.11967 )
- Using the Console - Chrome Developer Tools — Google DevelopersChrome
- Firebug and Logging : Firebug, 利用Firebug的console功能作JavaScript偵錯 - iT邦幫忙::IT知識分享社群 for Firefox
- Javascript var_dump function | Tsung's Blog
