1. // demo1 数组解构
    2. let arr = [1, 2, 3, 4];
    3. let [a, b] = arr;
    4. console.log('a=', a);
    5. console.log('b=', b);
    7. // demo2 对象解构
    8. let obj = {
    9.     name: 'zs',
    10.     age: 20
    11. }
    13. let { name, age } = obj;
    14. console.log('name=', name);
    15. console.log('age=', age);
    17. // demo3 在函数中使用解构 
    18. function Cat({ name, age }) {
    19.     this.name = name;
    20.     this.age = age;
    21. };
    23. let cat = new Cat({ name: '小花', age: 2 });
    24. console.log(cat);
    26. // demo3.2 函数参数使用默认值
    27. function Cat({ name = '小白', age = 1 }) {
    28.     this.name = name;
    29.     this.age = age;
    30. };
    32. let cat = new Cat({});
    33. console.log(cat);
    34. // demo3.3 使用默认值2
    35. function get(data = {}) {
    36.     console.log(url, data);
    37.     // todo
    38. }
    39. get();
    41. function Cat({ name = '小白', age = 1 } = {}) {
    42.     this.name = name;
    43.     this.age = age;
    44. };
    46. let cat = new Cat();
    47. console.log(cat);