JavaScript函数重新定义 [英] JavaScript function redefinition

问题描述

是否可以从自己的体内重新定义JavaScript函数。例如，我可以执行以下操作吗？

Is it possible to redefine a JavaScript function from within its own body. For example, could I do the following?

function never_called_again(args) {
  // Do some stuff
  never_called_again = function (new_args) {
    // Do some new stuff
  }
}

以上是否有效，是否具有正确的语义？我不想用旧的函数名创建一个新的全局变量，因为我试图在全局范围内做这种事情，但是从各种对象范围开始，我不希望当我发生名字冲突时在这些本地范围内重新定义函数。

Is the above valid and does it have the correct semantics? I don't want to create a new global variable with the old function name, because I'm trying to do this kind of thing not in the global scope, but from various object scopes, and I don't want name clashes when I redefine the function within those local scopes.

推荐答案

是的，您可以通过这种方式重新定义函数。

Yes, you can redefine a function that way.

运行此：

function never_called_again(args) {
    console.log('Func 1', args);

    never_called_again = function (new_args, x) {
        console.log('Func 2', new_args, x);
    }
}

never_called_again('arg A', 'arg B');

never_called_again('arg A', 'arg B');

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收益率：

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Yields this:

Func 1 arg A
Func 2 arg A arg B

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