Javascript Shell 地址：http://www.squarefree.com/shell/

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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.

Built-in functions

• ans : the result of the previous expression.
• print(expr) : prints expr on its own line.
  • for(i = 0; i < 6; ++i) print( i * i)
• pr(expr) : prints and returns its input, so you can use it to print intermediate results in the middle of an expression.
  • function fact(n) { return n>0 ? pr( n*fact(n-1)) : 1 }
• blink(node) or Alt+B : makes a node blink for a second.
  • blink( document.links[3])
• props(obj) or Alt+P : lists the methods and fields of an object.
  • props( document.body)
  • In Firefox, props also shows which properties belong to the object itself and which belong to objects in its prototype chain.