object1.html

<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <meta http-equiv="X-UA-Compatible" content="ie=edge" />
    <title>Document</title>
  </head>
  <body>
    <script>
      /*    var obj = {
          name: "张三"
        };
        Object.defineProperty(obj, "age", {
          //数据描述符
          value: 20,                 //值
          enumerable: false,          //是否可枚举
          writable: false,       //是否可以修改值
          configurable: false   //是否可以修改属性
        });
        for (var attr in obj) {
          console.log(attr);
        }

        delete obj.age;
        console.log(obj); */

      //   存取描述符
      /*  var obj = { name: "张三" };
      var age = 20;
      Object.defineProperty(obj, "age", {
        get: function() {
          console.log("你获取了数据");
          return age;
        },
        set: function(e) {
          age = e;
        },
        configurable: true,
        enumerable: true
      });
      obj.age = 30;
      console.log(obj.age); */
    </script>
  </body>
</html>