SOURCE

Function.prototype.myCall = function(context, ...args){
    if(typeof this !== 'function'){
        throw Error('this must be a function')
    }
    context = context || window;
    context.fn = this;
    result = context.fn(...args)
    delete context.fn;
    return result
}

Function.prototype.myApply = function(context,...args) {
  if (typeof this !== 'function') {
    throw new TypeError('Error')
  }
  context = context || window
  context.fn = this
  let result
  // 处理参数和 call 有区别
  if (args[0]) {
    result = context.fn(...args[0])
  } else {
    result = context.fn()
  }
  delete context.fn
  return result
}

function testCal(...args){
    console.log(this.name, ...args,'good')
}

let result = {
    name: 'yy'
}

testCal.myApply(result, [1,2,3])

Function.prototype.myCall = function(context, ...args){
    if(typeof this !== 'function'){
        throw Error('this must be a function')
    }
    context = context || window;
    context.fn = this;
    result = context.fn(...args)
    delete context.fn;
    return result
}

Function.prototype.myApply = function(context,...args) {
  if (typeof this !== 'function') {
    throw new TypeError('Error')
  }
  context = context || window
  context.fn = this
  let result
  // 处理参数和 call 有区别
  if (args[0]) {
    result = context.fn(...args[0])
  } else {
    result = context.fn()
  }
  delete context.fn
  return result
}

function testCal(...args){
    console.log(this.name, ...args,'good')
}

let result = {
    name: 'yy'
}

testCal.myApply(result, [1,2,3])