如何使用javascript传递具有可变参数的另一个函数中的函数？ [重复]

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• Calling dynamic function with dynamic parameters in Javascript [duplicate] 10 answers

在Javascript中调用动态参数的动态函数[重复] 10个答案

I have a pre-process function, here's an example function

我有一个预处理函数,这是一个示例函数

function preprocess (msg, fct) {
   alert(msg);
   fct(???);
}

I need to execute the function fct in the preprocess function, but fct not always has the same number of parameters. I am not a pro in javascript but I think there are 2 ways to achieve that :

我需要在预处理函数中执行函数fct,但是fct并不总是具有相同数量的参数。我不是javascript的专家,但我认为有两种方法可以实现:

1. explicit call with an object

   显式调用对象

   function preprocess (msg, fct, obj) { ... }
   

usage : preprocess ('hello', myfct, {firstparam: 'foo', secondparam: 'bar'});

用法:preprocess('hello',myfct,{firstparam:'foo',secondparam:'bar'});

2. using the argument inner property of the function

使用函数的参数inner属性

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anyways i might have the theory, i am not able to code both the case above. Is it possible to achieve what I need using both the ways ? if yes, could you provide a minimum example of each to show me the way ?

无论如何我可能有理论,我无法编码上述情况。是否有可能使用两种方式实现我需要的东西?如果是的话,你能提供一个最小的例子给我指路吗?

1 个解决方案

#1

You can pass the arguments at the end in variadic form, and use the arguments object to get what you need:

您可以以可变形式传递最后的参数,并使用arguments对象来获取所需内容:

function preprocess (msg, fct /*, ...as*/) {
  var as = [].slice.call(arguments, 2);
  alert(msg);
  fct.apply(this, as);
}

preprocess(msg, fct, a, b, c); // fct(a, b, c)