lovecoding
/
VIP32


			
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    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Document</title>
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    <script>
      /**
       * 1.原型链继承:
       * 构造函数 原型 实例
       */
      function Father() {
        this.name = "Lucy";
        this.arr = [1, 2, 3];
      }
      function Child() {
        this.age = 18;
      }
      Child.prototype = new Father();
      let newChild = new Child();
      console.log(newChild.arr,'新的')

      let a1 = new Child();
      let a2 = new Child();

      /**
       * 因为两个实例使用的是同一个原型，所以一个修改另一个也会发生改变
      */
      a2.arr.push(10);
      a1.name += 10; //a1.name = a1.name + 10
      a2.name += 20;
      console.log(a1,'a1');
      console.log(a2,'a2');


    </script>
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