对象拓展

  1. // 1.Object.is 判断两个值是否完全相等
  2.   // console.log(Object.is(121,121)) // === true
  3.   // console.log(Object.is(NaN,NaN)) // true
  4.   // console.log(NaN === NaN) // false
  6.   // 2.Object.assign 对象的合并
  7.   // const config1 = {
  8.   //   host: 'localhost',
  9.   //   port: 3306,
  10.   //   name: 'root',
  11.   //   pass: 'root',
  12.   //   test: 'test'
  13.   // }
  14.   //
  15.   // const config2 = {
  16.   //   host: 'http://www.baidu.com',
  17.   //   port: 3000,
  18.   //   name: 'baidu.com',
  19.   //   pass: 'iloveyou',
  20.   //   test2: 'test2'
  21.   // }
  22.   // console.log(Object.assign(config1,config2)) // {host: "http://www.baidu.com", port: 3000, name: "baidu.com", pass: "iloveyou", test: "test", test2: "test2"}
  24.   // 3.Object.setPrototypeOf 设置原型对象 Object.getPrototypeOf
  25.   const school = {
  26.     name: '陈朝鸿'
  27.   }
  28.   const cities = {
  29.     xuexiao: ['惠州','深圳']
  30.   }
  31.   Object.setPrototypeOf(school,cities)
  32.   console.log(Object.getPrototypeOf(school))
  33.   console.log(school)