JavaScript的apply和call方法及其区别

    /*定义一个人类*/  
    function Person(name,age)  
    {  
        this.name=name;  
        this.age=age;  
    }  
    /*定义一个学生类*/  
    function Student1(name,age,grade)  
    {  
        Person.apply(this,arguments);  
        this.grade=grade;  
    }  
    /*定义另一个学生类*/
     function Student2(name,age,grade)  
    {  
        Person.call(this,name,age);  
        this.grade=grade;  
    }  
    //创建一个学生类  
    var student1=new Student1("zhangsan",8,"一年级");
    var student2=new Student2("wangwu",9,"二年级");
    
　　console.log("name:"+student1.name+"\n"+"age:"+student1.age+"\n"+"grade:"+student1.grade); 
　　console.log("name:"+student2.name+"\n"+"age:"+student2.age+"\n"+"grade:"+student2.grade);