1. const arr = [1, 2, 3, 4]
    2. let [num1, num2, num3, num4] = arr
    3. console.log(num1, num2, num3, num4) // 1 2 3 4
    5. const obj = {
    6.   name: '名字',
    7.   age: '18',
    8.   eat: function (food) {
    9.     console.log('吃' + food)
    10.   }
    11. }
    13. let { name, age, eat } = obj
    14. console.log(name, age, eat)
    15. /* 
    16.  * 名字 18 ƒ (food) {
    17.  *   console.log('吃' + food)
    18.  * }
    19.  */
    20. eat('水果') // 吃水果