如果你不能用你给它们的名字真正引用它们，那么命名函数表达式有什么意义呢？ [英] What's the point of naming function expressions if you can't really reference them by the names you give them?

问题描述

如果你不能用你给它们的名字真正引用它们，那么命名函数表达式有什么意义？

What's the point of naming function expressions if you can't really reference them by the names you give them?

var f = function g() {
    console.log("test");
};

g(); // ReferenceError: g is not defined

推荐答案

哦，但是您可以通过该名称引用它们。这些名称只存在 in 函数的范围。

Oh, but you can reference them by that name. Those names just only exist inside the scope of the function.

var f = function g() {
    // In here, you can use `g` (or `f`) to reference the function
    return typeof g;
};

console.log( typeof g );
// It only exists as `f` here
console.log( f() );

DOCS： https：// developer。 mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/function#Named_function_expression

这篇关于如果你不能用你给它们的名字真正引用它们，那么命名函数表达式有什么意义呢？的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！