javascript中的属性注意事项

//原型 类似于父类
        function students() {
            this.major= '数学';
            this.studentsName = ['张三','李四','王五'];
        }
        var myStudents = new students(); //必须建立实例对象 才能被其他对象'继承';
        //建立对象
        function teacher(sub) {
          
        }
        teacher.prototype = myStudents;//设置原型

        var mathTeacher = new teacher(); //创建对象
        mathTeacher.studentsName[0] = '赵六';
       
        var englishTeacher = new teacher(); //创建对象
        englishTeacher.major = 'English';

        alert('studentsName=' + mathTeacher.studentsName + "  " + 'major=' + mathTeacher.major);//输出结果
        alert('studentsName=' + englishTeacher.studentsName + "  " + 'major=' + englishTeacher.major);//输出结果