javascript面向对象(七)

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<!doctype html><html>  <head>    <title>标题</title>    <meta charset="utf-8">    <script>      "use strict";      var emp={        id:1001,        name:"eric",        salary:10000      };      //id属性设置为只读      //salary属性设置为禁止遍历      //添加age属性，值为25，可读写，可遍历，可配置      Object.defineProperties(emp,{        id:{          writable:false,          configurable:false        },        salary:{          enumerable:false,          configurable:false,        },        age:{          value:25,          writable:true,          enumerable:true,          configurable:true        }      });      //emp.id=1002;//报错！      //delete emp.id;//报错！      for(var key in emp){        console.log(key+":"+emp[key]);      }      emp.age++;      console.log(emp.age);//26      /*设置id属性为只读      Object.defineProperty(emp,"id",{        writable:false,        configurable:false//不可逆      });*/      //delete emp.id;//禁止删除      /*      var id_attrs=      Object.getOwnPropertyDescriptor(        emp,"id"      );      console.dir(id_attrs)      */      /*      Object.defineProperty(emp,"id",{        writable:true      });//报错: 不允许重定义id属性      */      //emp.id=1002;//报错:不允许给只读属性赋值      //console.log(emp.id);      //设置salary属性不可遍历:      /*      Object.defineProperty(        emp,"salary",{          enumerable:false,          configurable:false,        }      );      for(var key in emp){        console.log(key+":"+emp[key]);      }      console.log(emp.salary);      */      /*      Object.defineProperty(emp,"age",{        value:25,        writable:true,        enumerable:true,        configurable:true,      });      console.dir(        Object.getOwnPropertyDescriptor(          emp,"age"        )      );      emp.age++;      console.log(emp.age);      */    </script>  </head>  <body>      </body></html>
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