覆盖参数对象的JavaScript函数 [英] Overwriting arguments object for a Javascript function

问题描述

如果我有以下几点：

    // Clean input.
    $.each(arguments, function(index, value) {

        arguments[index] = value.replace(/[\W\s]+/g, '').toLowerCase();
    });

请问这是一个糟糕的事是什么？我没有更多的使用在功能上未清洗参数，这将是很好不创造参数的无用副本只是为了使用它们，但是否有任何负面影响要这么做？

Would that be a bad thing to do? I have no further use for the uncleaned arguments in the function, and it would be nice not to create a useless copy of arguments just to use them, but are there any negative effects to doing this?

理想我想这样做，但我猜这个过程中遇到问题，因为参数是不是一个真正的数组：

Ideally I would have done this, but I'm guessing this runs into problems since arguments isn't really an Array:

    arguments = $.map(arguments, function(value) {

        return value.replace(/[\W\s]+/g, '').toLowerCase();
    });

感谢您的任何意见。

Thanks for any input.

编辑：我刚刚意识到，这两个现在里面自己的职能，所以参数对象发生了变化。任何方式做到这一点不会造成不必要的变量？

I've just realized that both of these are now inside their own functions, so the arguments object has changed. Any way to do this without creating an unnecessary variable?

推荐答案

我也不会想到，参数[I] =值; 工作，因为同样的原因， （这是不是一个真正的数组）。

I would not have thought that arguments[i] = value; works, because of the same reason (it is not a real array).

您真的应该考虑到清洁值分配给一个新的变量：

You really should consider to assign the cleaned values to a new variable:

var cleaned_args = $.map(arguments, function(value) {
    return value.replace(/[\W\s]+/g, '').toLowerCase();
});

在这里引入一个新的变量是没有必要。通常，你不直接对参数无论如何操作（因为它的缺点像你已经发现了一个），但它首先转换为真正的数组（这将涉及反正新变量）。

Introducing a new variable here is not unnecessary. Most often you don't directly operate on arguments anyway (because of its shortcomings like the one you already discovered), but convert it to a real array first (which will involve a new variable anyway).

关于您的编辑：

右键，第一个是行不通的，因为参数指的是匿名函数的参数。

Right, the first one would not work because arguments refers to the arguments of the anonymous function.

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