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class创建一个类,数组与对象解构方法
秋闲独醉
Original
353 people have browsed it
  1. <!DOCTYPE html>
  2. <html lang="en">
  3.   <head>
  4.     <meta charset="UTF-8" />
  5.     <meta http-equiv="X-UA-Compatible" content="IE=edge" />
  6.     <meta name="viewport" content="width=device-width, initial-scale=1.0" />
  7.     <title>Document</title>
  8.   </head>
  9.   <body>
  10.     <script>
  11.       //1. 用class创建一个类, 并实现自有,共享,静态成员的声明与输出
  12.       class Class1 {
  13.         //公共成员
  14.         age = 1;
  15.         constructor(name, email) {
  16.           //自有成员
  17.           this.name = name;
  18.           this.email = email;
  19.         }
  20.         //共享成员
  21.         getInfo() {
  22.           return `${this.name},${this.email}`;
  23.         }
  24.         //静态成员
  25.         static status = "enabled";
  26.       }
  27.       const obj1 = new Class1("ddkk", "eek@ww");
  28.       console.log(obj1);
  29.       console.log(obj1.getInfo());
  30.       console.log(Class1.status);
  32.       //类的继承
  33.       class Class2 extends Class1 {
  34.         constructor(name, email, age) {
  35.           super(name, email);
  36.           this.age = age;
  37.         }
  39.         getInfo() {
  40.           return `${super.getInfo()},${this.age}`;
  41.         }
  42.       }
  44.       const obj2 = new Class2("ieiei", "ek@33", 33);
  45.       console.log(obj2);
  46.       console.log(obj2.getInfo());
  47.     </script>
  48.     <script>
  49.       //2. 实例演示数组与对象解构方法
  50.       //声名定义
  51.       let [name, age, address] = ["jks", 12, "kdjdo"];
  52.       console.log(name, age, address);
  53.       //更新
  54.       [name, age, address] = ["jdnjd", 19, "122"];
  55.       console.log(name, age, address);
  56.       //参数不足，默认值
  57.       [name, age, address = "中国"] = ["dkdk", 13];
  58.       console.log(name, age, address);
  59.       //参数过多，...rest
  60.       [name, ...rest] = ["dd", "33", "333"];
  61.       console.log(name, rest);
  62.       //多用于多数据互换
  63.       let x = 1;
  64.       let y = 2;
  65.       let z = 3;
  66.       [z, y, x] = [x, y, z];
  67.       console.log(x, y, z);
  69.       //对象解构,可用于json数据处理
  70.       //目标是把对象中的属性值保存到对应的，与属性同名的变量中
  71.       let { id, name: productName, num } = { id: 1, name: "dkdk", num: 33 };
  72.       console.log(id, productName, num);
  73.       //更新，用一对大括号，把整个表达式封装起来
  74.       ({ id, name: productName, num } = { id: 2, name: "dkdk", num: 33 });
  75.       console.log(id, productName, num);
  77.       //如果左边模板中的变量存在命名冲突怎么办？起一个别名name:productName
  78.       let { id: itemId, ...arr } = { id: 1, name: "dkdk", num: 33 };
  79.       console.log(`${itemId}`);
  80.       console.log(arr);
  81.     </script>
  82.   </body>
  83. </html>
Correcting teacher：PHPzPHPz

Correction status：qualified

Teacher's comments：
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