JavaScript Shell

Features:

• You can enter statements and expressions at the same prompt.
• The result of each non-void statement or expression is shown.
• User-defined variables.
  • b = document.body
• User-defined functions.
  • function f() { return 5; }
• JavaScript error messages are shown in red.
• Previous statements and expressions are available through Up and Down arrow keys.
• Tab completion.
• Multiline input (Shift+Enter to insert a line break).
• If the shell is opened using a bookmarklet, JavaScript typed into the shell runs in the context of the original window.
• Works well in Firefox, mostly works in Opera 8 and in IE 6 for Windows.

Suggested uses:

• Test short bits of JavaScript, bookmarklets, or user scripts. (For longer bits of JavaScript, try the JavaScript development enviornment too.)
• Explore DOM objects such as document.body using props (Alt+P) to figure out what is possible.
• Explore the DOM of a specific page using the bookmarklet version of the shell.
• Modify the DOM of a specific page using the bookmarklet version of the shell.
• Use the shell like you would use the home screen of a calculator such as a TI-83. Alt+M gives you easy access to math functions such as sin and pow.