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自己实现call,apply,bind #9

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luichooy opened this issue Sep 3, 2019 · 0 comments

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luichooy commented Sep 3, 2019

call

Function.prototype.myCall = function(context = window, ...args) {
  let fn = this;
  let key = Symbol("key");
  context[key] = fn;

  const res = context[key](...args);
  delete context[key];
  return res;
};

apply

Function.prototype.myApply = function(context = window, args) {
  let fn = this;
  let key = Symbol("key");
  context[key] = fn;

  const res = context[key](...args);
  delete context[key];
  return res;
};

bind

Function.prototype.myBind = function(context = window, ...args) {
  const fn = this;

  const bindFn = function() {
    return fn.apply(
      this instanceof bindFn ? this : context,
      args.concat(Array.prototype.slice.call(arguments))
    );
  };

  bindFn.prototype = Object.create(this.prototype);

  return bindFn;
};

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