How to get a functions's body as string?

Question

I want to know how to convert a function\'s body into a string?

function A(){
  alert(1);
}

output = eval(A).toString() // this will come with  function A()         


        

Answer 1

You could just stringify the function and extract the body by removing everything else:

A.toString().replace(/^function\s*\S+\s*\([^)]*\)\s*\{|\}$/g, "");

However, there is no good reason to do that and toString actually doesn't work in all environments.