javascript get function body

Question

I have a function e.g.

var test = function () {alert(1);}

How can I get the body of this function?

I assume that the only way is to

Answer 1

2015 update

Upon revisiting the state of function decompilation, it can said that it's generally safe in certain well-considered use cases and enviroments (e.g: Node.js workers with user defined functions).

It should be put in the same bucket as eval, which is a powerful tool that has its place, but should only be used on rare occasions. Think twice, that's my only advice.

The conclusions from Kangax's new research:

• It's still not standard
• User-defined functions are generally looking sane
• There are oddball engines (especially when it comes to source code placement, whitespaces, comments, dead code)
• There might be future oddball engines (particularly mobile or unusual devices with conservative memory/power consumption)
• Bound functions don't show their original source (but do preserve identifier... sometimes)
• You could run into non-standard extensions (like Mozilla's expression closures)
• ES6 is coming, and functions can now look very different than they used to
• Minifiers/preprocessors are not your friend

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"function decompilation" — a process of getting string representation of a Function object.

Function decompilation is generally recommended against, as it is a non-standard part of the language, and as a result, leads to code being non-interoperable and potentially error-prone.

@kangax on comp.lang.javascript