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demo's Issues

Object.Prototype隐式屏蔽

b.a 赋值的时候会通过Prototype去找a.a并去获取a.a的值,然后通过[[Put]]将3赋值给b.a 隐式屏蔽

var a = { a: 2}; var b = Object.create(a); 
b.a = 3;
console.log(b.a,a.a)
// => 3 2
 
var a = { a: 2}; var b = Object.create(a); 
a.a = 3;
console.log(b.a,a.a)
// => 3 3
 
var a = { a: 2}; var b = Object.assign({}, a); 
b.a = 3;
console.log(b.a,a.a)
// => 3 2

f(1)(2)实现

方法一

function f(a,b){
  return function(b){
        return a + b;
  }
}
f(1)(2) // => 3
// 利用闭包在第一次调用的时候创建a

方法二

function f(a){
  f.add = function(x,y){
   return x + y
  }
  return f.add.bind(null, a)
}
f(2)(3) // => 5
//利用bind改变this,参数柯里化

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