JS対象者向け

window.onload=function(){
        //1.    ：
        function student1(name,qq){
                var obj=new Object();
                obj.name=name;
                obj.qq=qq;
                obj.show=function(){
                        alert(this.name+":"+this.qq);
                }
                return obj;
        }
        var s1=student1("HH","123");
        console.log(s1);

        //2.    ：
        function Student2(name,qq){
                this.name=name;
                this.QQ=qq;
                this.show=function(){
                        alert(this.name+":"+this.QQ);
                }
        }
        var s2=new Student2("HH","1234");
        console.log(s2);

        //3.     ：
        var s3={
                "name":"HH",
                "QQ":"12345",
                show:function(){
                        alert(this.name+":"+this.QQ);
                //alert(name+":"+QQ);//  ！！！
                }
        }
        //s3.show();
        //console.log(s3.name+":"+s3.QQ);
        console.log(s3);
        //          ，           prototype   ，    new                prototype  。 ：
        console.log(s1.prototype);//undefined;
        console.log(student1.prototype);//Object;
        console.log(s2.prototype);//undefined;
        console.log(Student2.prototype);//Object;
        console.log(s3.prototype);//undefined;

        function Student4(){ };
        Student4.prototype = {
                name:"fdf",
                age:"fd",
                //          constructor              object
                //     
                constructor :Student
        };
        var s4 = new  Student();
        alert(s4.constructor);
}

window.onload=function(){
        function Student(){};
        Student.prototype.name="HH";
        Student.prototype.show=function(){
                alert("I am "+this.name);
        }

        var s=new Student();
        //s.show();
        //alert(s.name);
        Student.prototype.name="FF";
        //alert(s.name);
        //           ：1.    ； 2.    

        function Student1(){
                this.name="FF";
        };
        Student1.prototype.name="HH";
        Student1.prototype.show=function(){
                alert("I am "+this.name);
        }
        var s1=new Student1();

        console.log(s1.name);//FF
        console.log(s1.__proto__.name);//HH
        console.log(Student1.prototype.name);//HH

        Student1.prototype.name="O_O";

        console.log(s1.name);//FF
        console.log(s1.__proto__.name);//O_O
        console.log(Student1.prototype.name);//O_O

        //                          
}

window.onload=function(){
        //    ：     +  
        function Student(name,QQ){
                this.name=name;
                this.QQ=QQ;
                if(typeof this.show != "function"){
                        Student.prototype.show=function(){
                                //alert(this.name+":"+this.QQ);
                                console.log(this); // this s1
                        }
                }
        }
        var s1=new Student("MM","1242");
        s1.show();
        var s2=new Student("QQ","w809r809ew");
        console.log(s1.show==s2.show);//true;  Student         show，    Student    ，         。
}