馬久里的部落格

上班無聊，挖一些JS物件相關資訊紀錄：

var myobj = new object();

myboj.name = '小馬';

myobj.age = '28'

myobj.height = '181'

//可以改寫為
with(myboj){
    name = '小馬';

    age = '28';

    height = '181';
}


//==========也可以使用建構函數==============
function SetProperty(name,age,height){
    this.name = name;

    this.age = age;

    this.height = height;

}

var myobj = new SetProperty('小馬','28','181');

documnet.write(myobj.name) //小馬


//==========也可以將方法加入物件==============
function SetProperty(name,age,height){
    this.name = name;

    this.age = age;

    this.height = height;

    this.print = myfun;

}

function myfun(){
    documnet.write(this.name + '<br>'); 
    documnet.write(this.age + '<br>'); 
    documnet.write(this.height + '<br>'); 

}

var myobj = new SetProperty('小馬','28','181');

myobj.print(); 

//小馬
//28
//181


//==========動態新增物件屬性、方法==============
function SetProperty(name,age,height){
    this.name = name;

    this.age = age;

    this.height = height;

    this.print = myfun;

}

function myfun(){
    documnet.write(this.name + '<br>'); 
    documnet.write(this.age + '<br>'); 
    documnet.write(this.height + '<br>'); 
    documnet.write(this.weight + '<br>');

}

function Caculate(){
    document.write(1+1);
}
//替物件新增weight的屬性
SetProperty.prototype.weight = 72;

var myobj = new SetProperty('小馬','28','181');

myobj.print();

//小馬
//28
//181
//72

//替物件新增Caculate方法
SetProperty.prototype.execute = Caculate;
SetProperty.execute();
//2

//==========物件繼承==============

function SetProperty(name,age,height){
    this.name = name;

    this.age = age;

    this.height = height;
}

function circle(r){
    this.r = r;
    this.showResult = showResult;

    function showResult(){
        var result = 3.14*r*r;
        document.write(this.name + '<br>')
        document.wirte('面積:' + result);
    }
}

//Prototype物件繼承;
circle.prototype = new SetProperty('小馬');

var mycircle = new circle(2);

mycircle.showResult();
//小馬
//12.56