使用变量的字符串值作为函数名来调用[重复]

Question

如何根据变量的值调用列出的函数之一

called_function

？

function a() { alert('You called the a function.'); }
function b() { alert('You called the b function'); }
function c() { alert('You called the c function'); }

const possible_strings = ["a", "b", "c"];
const called_function = Math.floor(Math.random() * possible_strings.length);

这不起作用：

window[called_function]();

运行

window[called_function]();

时，它说undefined.

Answer 1

您将

called_function

设置为数组中项目的索引。然后，您需要在数组中查找该索引以获取函数名称。

function a() { alert('You called the a function.'); }
function b() { alert('You called the b function'); }
function c() { alert('You called the c function'); }

const possible_strings = ["a", "b", "c"];
const called_function = possible_strings[Math.floor(Math.random() * possible_strings.length)];

window[called_function]()

你也可以直接引用函数，而不是使用字符串，像这样：

function a() { alert('You called the a function.'); }
function b() { alert('You called the b function'); }
function c() { alert('You called the c function'); }

[a,b,c][Math.random()*3|0]()