對事物的抽象描述
描述這類事物的特徵和行為
物件是類別的實例
程式碼實作：建立一個類別
function peple(){
this.hp=0;
this.act = 30;
this.name = "";
this.x=0;
this.y=0;
this.move =function(x,y){
document.write(this.name+"正在移动到"+x+","+y);
}
this.eat=function(){
document.write("正在吃");
}
}類別的實例：建立一個物件
var p1 = new peple();
p1.name="阿达";
p1.hp = 100;
p1.move(100,100);
p1.move(22,200);p1.fire = function(x,y){
document.write(this.name+"正在开火向"+x+","+y);
p1.hp--;
}
