如何获取JavaScript当前运行的线路代码？

Question

I want to write a function in JavaScript, it needs to get the string form (text in source code) of its parameter instead of the value of the parameter.

Note: The type of the parameter may be anything, not restricted to be of string, and the value of the parameter may be any expression.

For example:

function processParam(param)
{
    let literalCode = ""; 
    ...
}

// I want to get the string "100 * 2" instead of 200 inside this function.
processParam(100 * 2); 


// I want to get the string "console.log('abc')" instead of undefined inside this function.
processParam(console.log('abc')); 

In other words, I want to get the code of the line that is currently running. How can I do this?

Answer 1

That is not really possible like that. But with a slight change you can get some source code. Functions have source code. So if you pass the argument as a function, you can get the source code. And if you want the actual value, you should execute it.

Here is a demo:

 function processParam(param){ let literalCode = param.toString().split("=>").pop().trim(); console.log(literalCode); let actualValue = param(); // execute it } processParam(() =>100 * 2); processParam(() => console.log('abc'));