javascript面向对象实例

非私有属性
function Student(name, gender, age, grade, teacher){      
          this.name = name;     
          this.gender = gender;     
          this.age = age;       
          this.grade = grade;      
          this.teacher = teacher; 
}     
var bob = new Student("bob", "male", 15, 10, "Marlow");    
    alert(bob.age); //输出15   
var susan = new Student("susan", "female", 10, 5, "Gresham");  
    alert(susan.gender); //输出 'female' 

var bob = new Student("bob", "male", 15, 10, "Marlow");   
  alert(bob.age); //输出15     bob.age = 9;  
  alert(bob.age); //输出9; 
#####################################################################################################################################
私有属性
function Student(name, gender, age, grade, teacher)     {      
   var studentName = name;     
   var studentGender = gender;    
   var studentGrade = grade;     
   var studentTeacher = teacher;    
   var studentAge = age;     
       this.getAge = function() {        
                return studentAge;   
       };         
       this.setAge = function(val){      
                  studentAge = Math.abs(val); //使用绝对值，确保年龄是正值      
       };  
}     
       var bob = new Student("bob", "male", 15, 10, "Marlow");    
       alert(bob.studentAge); //未定义，因为年龄在类定义中受私有保护    
       alert(bob.getAge()); //输出15     bob.setAge(-20);     alert(bob.getAge()); //输出20 
#####################################################################################################################################
动态创建的访问器方法
function Student( properties ){    
         var $this = this;  //将类范围存储到名为$this的变量中     
             //迭代处理对象的属性      
                for ( var i in properties ) {        
                         (function(i) {        
                                      // 动态创建访问器方法      
                                     $this[ "get" + i ] = function(){                
                                             return properties[i];         
                                                                       };       
                                     })(i);      
                }   
}    
                 // 创建一个新的用户对象实例，并传递属性的对象   
                   var student = new Student({Name: "Bob",Age: 15,Gender: "male"});    
                    alert(student.name); //因属性是私有的而未定义   
                    alert(student.getName()); //输出 "Bob"   
                    alert(student.getAge()); //输出15    
                    alert(student.getGender()); //输出 "male" 
#####################################################################################################################################
类的继承
function Worker() {    
     this.getMethods = function(properties, scope)
     {         var $this = scope;  //将类范围存储到名为$this的变量中     
                 //迭代处理对象的属性        
                  for ( var i in properties ){        
                          (function(i){                 // 动态创建访问器方法           
                                    $this[ "get" + i ] = function()           
                                          { 
                                              return properties[i];
                                              };             //动态地创建一个分析整数，并确保是正值的更改器方法。         
                                     $this[ "set" + i ] = function(val) { 
                                         
                                                 if(isNaN(val)) { 
                                                     
                                                      properties[i] = val;  
                                                                    
                                              }else{       
                                                               
                                                   properties[i] = Math.abs(val); 
                                                   
                                              } 
                                      }; 
                          })(i);         
                }     
     }; 
} 
// CommissionWorker "子类"和WageWorker "子类" 
//继承Worker的属性和方法。
 CommissionWorker.prototype = new Worker();
 WageWorker.prototype = new Worker(); 
 
function CommissionWorker(properties) {     
      this.getMethods(properties, this);     
      //计算收入     
      this.getIncome = function(){        
           return properties.Sales * properties.Commission; 
      } 
} 
//要求有下列属性：薪水、每周小时数、每年周数 
function WageWorker(properties) {     
    this.getMethods(properties, this);   
      //计算收入     
    this.getIncome = function() {        
         return properties.Wage * properties.HoursPerWeek * properties.WeeksPerYear;    
          } 
} 
var worker = new WageWorker(Name: "Bob", Wage: 10, HoursPerWeek: 40,WeeksPerYear: 48 }); 
alert(worker.wage); //未定义。薪水是私有属性。 
worker.setWage(20); alert(worker.getName());   //输出 "Bob" 
alert(worker.getIncome()); //输出 38,400 (20*40*48) 
var worker2 = new CommissionWorker( {     Name: "Sue",     Commission: .2,     Sales: 40000 }); 
alert(worker2.getName());   //输出 "Sue" 
alert(worker2.getIncome()); //输出8000（2% 乘40,000）