is there a way to execute a function when I have its name in a string [duplicate]

问题

This question already has answers here:

How to execute a JavaScript function when I have its name as a string (33 answers)

Closed 5 years ago.

Consider I have a name of a function which does not require any argument in a var -

var fn = "foo";

Can I execute it in some or similar like this -

eval(fn);

It does not work. Please suggest.

My definition of function will look like this -

function foo() {
  ....do something....
}

回答1:

try this

eval(fn)();

or this

eval(fn + "()");

回答2:

Please do not use eval.

If the function is in global scope, simply do

var fn = "foo";
window[fn]();

DEMO

来源：https://stackoverflow.com/questions/16183571/is-there-a-way-to-execute-a-function-when-i-have-its-name-in-a-string