js Object属性方法使用

‘use strict‘;
//对象的复制；
function copy(obj) {
  //基于传入的对象，创建子对象
  var a = Object.create(Object.getPrototypeOf(obj));
  //得到要复制对象的属性名
  var propNames = Object.getOwnPropertyNames(obj);
  //复制对象的值
  propNames.forEach(function (name) {
    var desc = Object.getOwnPropertyDescriptor(obj, name);
    //创建对象
    Object.defineProperty(a, name, desc);
  })
  return a;
}
var obj1 = {
  a: 1,
  b: 2,
  c: 3
};
var obj2 = copy(obj1);
console.log(obj2);