如何使用参数传递对函数的引用？ [英] How can I pass a reference to a function, with parameters?

问题描述

可能重复：

如何在JavaScript函数调用中预先设置参数？ （部分功能申请）

我需要能够通过引用具有给定参数集的函数。

以下是传递 而不带参数的示例：

Here is an example of passing a reference without parameters:

var f = function () {
    //Some logic here...
};

var fr = f; //Here I am passing a reference to function 'f', without parameters
fr(); //the 'f' function is invoked, without parameters

现在我需要做的就是通过相同的 f 函数，但这次我需要将参数传递给引用。现在，我可以使用匿名函数执行它并使用新创建的函数内的参数调用 f 函数，如：

Now what I need to do is pass the same f function, but this time I would need to pass parameters to the reference. Now, I can do it with an anonymous function and invoke the f function with parameters inside the newly created function, like such:

var f = function () {
        //Some logic here...
    };

var fr = function (pars) {
    f(pars);
}; //Here I am creating an anonymous function, and invoking f inside it

fr({p : 'a parameter'}); //Invoking the fr function, that will later invoke the f function with parameters

但我的问题是， 有没有办法直接引用 f 函数，参数为 fr ，但没有封闭它是匿名函数吗？

But my question is, Is there a way to pass a direct reference to the f function With parameters to fr, but without enclosing it in an anonymous function?

我需要分配给 fr 到使它不带参数调用（ fr（）），这样当 fr 被调用？

What do I need to assign to fr to make it invokable without parameters (fr()), so that f(1,2,3) is executed when fr is invoked?

[更新]
我跟着 Jason Bunting 对部分功能的问题/ 321113>这里以及他发布的JavaScript功能正是我所寻找的。以下是解决方案：

[UPDATE] I followed Jason Bunting's answer to here about the Partial Function and the JavaScript function he posts there is exactly what I was looking for. Here is the solution:

function partial(func /*, 0..n args */) {
  var args = Array.prototype.slice.call(arguments).splice(1);
  return function() {
    var allArguments = args.concat(Array.prototype.slice.call(arguments));
    return func.apply(this, allArguments);
  };
}

推荐答案

你所追求的是什么部分功能应用。

不要被那些不理解它和currying之间的细微差别的人所迷惑，他们 不同。

Don't be fooled by those that don't understand the subtle difference between that and currying, they are different.

部分函数应用程序可用于实现，但不是 currying。以下是 关于差异的博文 的引用：

Partial function application can be used to implement, but is not currying. Here is a quote from a blog post on the difference:

部分应用程序接受一个函数并从中构建一个函数，该函数接受较少的参数，currying构建函数，这些函数采用多个参数组合每个函数都只有一个参数。

Where partial application takes a function and from it builds a function which takes fewer arguments, currying builds functions which take multiple arguments by composition of functions which each take a single argument.

这个问题已经得到解答，请看这个问题的答案： 如何在JavaScript函数调用中预先设置参数？

This has already been answered, see this question for your answer: How can I pre-set arguments in JavaScript function call?

示例：

var fr = partial(f, 1, 2, 3);

// now, when you invoke fr() it will invoke f(1,2,3)
fr();

再次，请参阅该问题了解详情。

Again, see that question for the details.

这篇关于如何使用参数传递对函数的引用？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！