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2021/02/05 - Object.create() #47

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lxinr opened this issue Feb 5, 2021 · 0 comments
Open

2021/02/05 - Object.create() #47

lxinr opened this issue Feb 5, 2021 · 0 comments
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JS基础

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@lxinr
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lxinr commented Feb 5, 2021

不会继承对象原型链上的属性

  1. 可以得到一个非常干净且高度可定制的对象当作数据字典
  2. 可以节省hasOwnProperty带来的一点点性能损失

Object.create()、new Object()和{}的区别

  1. 字面量和new关键字创建的对象是Object的实例，原型指向Object.prototype，继承内置对象Object
  2. Object.create(arg, pro)创建的对象的原型取决于arg，arg为null，新对象是空对象，没有原型，不继承任何对象；arg为指定对象，新对象的原型指向指定对象，继承指定对象
@lxinr lxinr added the JS基础 label Feb 5, 2021
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