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");
}
}类的实例：创建一个对象
var p1 = new peple(); p1.name="阿达"; p1.hp = 100; p1.move(100,100); p1.move(22,200);在类外部动态扩展方法
p1.fire = function(x,y){
document.write(this.name+"正在开火向"+x+","+y);
p1.hp--;
}调用函数外部定义的函数
p1.fire(00,00);
p1.fire(43,22);
p1.fire(66,88);
document.write("hp="+p1.hp);