对象的基础用法和解构赋值

let a = 1;
let obj = { a }
console.log(obj) //{a:1}

let count = 0
    function addcount(key) {
      return `${key}_${count++}`
    }
    const nameKey = 'name';
    const agekey = "age";
    const jobKey = "job";
    let person = {
      [addcount(nameKey)]: 'Matt',
      [addcount(agekey)]: 27,
      [addcount(jobKey)]: '小明'
    }
    console.log(person)   //{name_0:'Matt',age_1,27,job_2:'小明'}
    console.log(nameKey) //name、

let obj2 = {
      // sayName: function (name) {
      //   console.log(name)
      // }
      // 简写
      sayName(name) {
        console.log(name)
      }
    }
    obj2.sayName('执行了')

let [a,b]=[1,2]
//交换两个变量的值
let[a,b]=[b,a]
//扩展运算符的运用
let[a,...b]=[1,2,3]　
//有默认值  右侧的参数等于undefined，默认值生效
let[a=3,b]=[1,2]

let {a,b}={a:1,b:2} 
//等价于
let {a:a,b:b}={a:1,b:2};
let{a,...b}={a:1,b:2,c:3}

let person = {
      name: '小红',
      age: 12,
      say: {
        talk: '脱口秀'
      }
    };
    let personCopy = {};
    ({ name: personCopy.name, age: personCopy.age, say: personCopy.say } = person)
    console.log(personCopy)
    let { say: { talk } } = person;
    console.log(talk)   // "脱口秀"

//在参数列表中进行解构赋值
    let person = {
      name: '小红',
      age: 12
    };
    function woman(color, { name, age }, sex) {
       //对参数解构赋值不会影响arguments对象
      console.log(arguments)
      console.log(name, age)
    }
    woman('red', person, '女')