解释bindbind()函数 [英] Explain bindbind() function

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本文介绍了解释bindbind()函数的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!

问题描述

有人可以解释这个函数吗?

  var bindbind = Function.prototype.bind.bind(Function.prototype.bind) ; 

我了解它产生的结果:

  var bindedContextFunc = bindbind(function)(context); 
bindedContextFunc(args);

但是不明白创建这个函数的过程,我的意思是 bind OK。

我们在这里有三次 Function.prototype.bind 函数,它们的(简化)代码

  function bind(context){
var fn = this;
return function(){
return fn.apply(context,arguments);
}
}

我会缩写为一种更实用的风格,部分应用:绑定 fn (context) - > fn context

那么它有什么作用?你有 bind.call(bind,bind)或绑定 bind (bind)。让我们展开这个来绑定 bind 。如果我们现在提供了一些参数?


bind bind (bind)(fn) (上下文)



绑定绑定 (fn)(上下文)



bind fn (context)



fn context


我们可以将它分配给一些变量,以使结果更清晰:


bindbind = bind bind (bind)



bindfn = bindbind anything (fn) // bind < sub>



contextbindfn = bindfn anything (context) // fn context



result = contextbindfn anything (args) // fn context (args)



Can someone explain this function?

var bindbind = Function.prototype.bind.bind(Function.prototype.bind);

I understand the result it produce:

var bindedContextFunc = bindbind(function)(context);
bindedContextFunc(args);

But do not understand process of creating this functions, I mean part bind(Function.prototype.bind)

解决方案

OK. We have three times the Function.prototype.bind function here, whose (simplified) code

function bind(context) {
    var fn = this;
    return function() {
        return fn.apply(context, arguments);
    }
}

I will abbreviate in a more functional style with lots of partial application: bindfn(context) -> fncontext.

So what does it do? You have got bind.call(bind, bind) or bindbind(bind). Let's expand this to bindbind. What if we now supplied some arguments to it?

bindbind(bind) (fn) (context)

bindbind(fn) (context)

bindfn(context)

fncontext

Here we are. We can assign this to some variables to make the result clearer:

bindbind = bindbind(bind)

bindfn = bindbindanything(fn) // bindfn

contextbindfn = bindfnanything(context) // fncontext

result = contextbindfnanything(args) // fncontext(args)

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