<script>  
    function Employee(name){  
        this.name = name;  
        //this.getName = function(){return this.name};方法代码应该放到原型对象之中，而不是初始化函数中，这样每个employee对象都共享同一个方法代码  
    }  
    Employee.prototype.getName = function(){return this.name};  
    var employee = new Employee(‘Jack‘);  
    console.log("employee.getName(): " + employee.getName());//Jack  
    var employee2 = new Employee(‘Jack2‘);  
    console.log("employee2.getName(): " + employee2.getName());//Jack2    
    function Coder(name,language){  
        this.name = name;  
        this.language = language;  
        //this.getLanguage = function(){return this.language}; 方法代码应该放到原型对象之中，而不是初始化函数中，这样才能实现代码共享  
    }  
    Coder.prototype = new Employee(‘‘);  
    Coder.prototype.constructor = Coder;//这一句话其实也可以不写，不影响继承  
    Coder.prototype.getLanguage = function(){return this.language};  
  
    var coder = new Coder(‘Coder Jack‘,‘Java‘);  
    console.log("coder.getName(): " + coder.getName());//Coder Jack  
    console.log("coder.getLanguage(): "+coder.getLanguage());//Java  
    var coder2 = new Coder(‘Coder Lee‘,‘C#‘);  
    console.log("coder2.getName(): " + coder2.getName());//Coder Lee  
    console.log("coder2.getLanguage(): " + coder2.getLanguage());//C#  
    var coder3 = new Coder(‘Coder Liu‘,‘C++‘);  
    console.log("coder3.getLanguage(): " + coder3.getName());//Coder Liu  
    console.log("coder3.getLanguage()" + coder3.getLanguage());//C++  
      
    console.log("employee.constructor: " + employee.constructor);  
    console.log("employee.constructor.prototype === Employee.prototype: " + (employee.constructor.prototype === Employee.prototype));  
    console.log("employee.constructor.prototype.constructor === Employee: " + (employee.constructor.prototype.constructor === Employee));  
    console.log("employee instanceof Object: "  + (employee instanceof Object));  
    console.log("employee instanceof Function: "  + (employee instanceof Function));  
    console.log("employee instanceof Employee: "  + (employee instanceof Employee ));  
    console.log("Employee.prototype.isPrototypeOf(employee): "  + (Employee.prototype.isPrototypeOf(employee)));  
    console.log("Function.prototype.isPrototypeOf(employee): "  + (Function.prototype.isPrototypeOf(employee)));  
    console.log("Object.prototype.isPrototypeOf(employee): "  + (Object.prototype.isPrototypeOf(employee)));  
    console.log("coder.constructor: " + coder.constructor);  
    console.log("coder instanceof Object: "  + (coder instanceof Object));  
    console.log("coder instanceof Function: "  + (coder instanceof Function));  
    console.log("coder instanceof Employee: "  + (coder instanceof Employee ));  
    console.log("coder instanceof Coder: "  + (coder instanceof Coder ));  
    console.log("Employee.prototype.isPrototypeOf(coder): "  + (Employee.prototype.isPrototypeOf(coder)));  
    console.log("Coder.prototype.isPrototypeOf(coder): "  + (Coder.prototype.isPrototypeOf(coder)));  
    console.log("Function.prototype.isPrototypeOf(coder): "  + (Function.prototype.isPrototypeOf(coder)));  
    console.log("Object.prototype.isPrototypeOf(coder): "  + (Object.prototype.isPrototypeOf(coder)));  
  </script>