lovecoding
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VIP28


			
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  <title>Document</title>
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<body>
  <script>
    /* var obj = {
      name: 'zs',
      age: 18,
      eat: function () {
        console.log('eat')
      }
    }
    var obj1 = {
      name: 'lisi',
      school: 'xiwangxiaoxue'
    } */
    /* 合并对象 用obj1区覆盖obj */
    // var obj2 = Object.assign(obj,obj1)
    // console.log(obj2)

    /* 合并对象 */
    // var obj3 = {...obj1,...obj}
    // console.log(obj3)


    /* Object.setPrototypeOf 设置原型对象 */
    /* Object.getPrototypeOf 获取原型对象 */
    /* let obj1 = {
      name: 'harbin'
    }
    let city = {
      area: ['shenyang','dalian','changchun']
    }
    console.log(Object.setPrototypeOf(obj1,city))
    console.log(Object.getPrototypeOf(obj1)) */

    /* 判断是否相等 */
    /* console.log(Object.is(1,-1))
    console.log(Object.is(-0,0))
    console.log(Object.is(NaN,NaN)) */
    // console.log(0 === -0)

    /* 返回一个对象的所有自身属性的描述对象 */
    /* const obj = {
      a: 1
    }
    console.log(Object.getOwnPropertyDescriptors(obj)) */

    /* const obj = {
      a: 1,
      b: 2
    }
    console.log(Object.values(obj))
    console.log(Object.entries(obj)) */

    /* 检查一个对象自身是否拥有给定的属性 不考虑原型链 */
    const obj = Object.create({
      a: 1
    })
    obj.b = 2
    console.log(Object.hasOwn(obj,'a'))
    console.log(Object.hasOwn(obj,'b'))


  </script>
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