<!DOCTYPE html> <html> <head> <meta charset="utf-8"> <title></title> <!-- 1.Object_defineProperty()的使用 Object.defineProperty(对象名称,属性名称,添加的属性) 增删改查Object里的属性 enumerable:false //控制属性是否可以枚举(枚举:数组,便利读取不到里面属性)如: console.log(Object.keys(person)); writable:false //控制属性是否可以被修改(没啥用) configurable:false //控制属性是否可以删除 set(): get(): --> </head> <body> <script> let number = 20; let person = { name : "张三", sex : '男', } Object.defineProperty(person,'age',{ value1: 19, //可枚举 enumerable:true, //删除 configurable:true, get:function re() { console.log('读取get了'); return number; }, set(value1) { console.log('修改了number属性',value1); number = value1; } }) //console.log(person); //console.log(Object.keys(person)); </script> </body> </html>