对象操作

练习内容

// 对象的基本操作\nconst student = {\n name: "张三",\n age: 20,\n grade: "大二"\n};\n\nstudent.major = "计算机"; // 添加新属性\nconsole.log("学生信息:", student);\nconsole.log(`姓名: ${student.name}`);\nconsole.log(