如何在JavaScript中使用var值名称作为函数名称

Question

Hi guys can i use value as a function name in JavaScript? i have some functions with same name input values such as:

var ta = $('li.ramin.active').attr("id");
var act = $('input[name="'+ta+'_acceptdeny"]:checked').val();


act(Freq, meID);  // my question is

in this way i have error "Uncaught TypeError: act is not a function" yes i know act is not a function but i want to use var act value as function name!! so i need to know how i can do that? thanks to all

Answer 1

You can use window[act](Freq, meId)

Thanks Justin Niessner for pointing out this will only work if act is defined in the global scope. You could use eval , however, this is generally considered to be very unsafe.

Answer 2

没有什么可以阻止您将行为重新声明为函数，从此以后，您将丢失对初始声明的行为的所有引用。

Answer 3

Instead of using the value as a function name, put the functions into an object, and use the value as the key to the object.

var myFunctions = {
    'func1': function() { .... },
    'func2': function() { .... },
    // and so on
};

var ta = $('li.ramin.active').attr("id");
var act = $('input[name="'+ta+'_acceptdeny"]:checked').val();

myFunctions[act](Freq, meID);

This is better because you can't accidentally call a function that was not intended to be used by the application, it can only call functions in the myFunctions object.