//普通用户
function Price(){
this.discount =1
}
Price.prototype.getPrice =function(price){
return price *this.discount
}
//vip用户
function VipPrice(){
this.discount =0.5
}
VipPrice.prototype.getPrice =function(price){
return price *this.discount
}
//超级VIP用户
function SuperVipPrice(){
this.discount =0.3
}
SuperVipPrice.prototype.getPrice =function(price){
return price *this.discount
}
//上下文
function Context(){
this.name="";
this.strategy=null;
this.price=0
}
Context.prototype.set=function(name,strategy,price){
this.name=name;
this.strategy=strategy;
this.price=price;
}
Context.prototype.getResult=function(){
console.log(this.name+"的价格是:"+this.strategy.getPrice(this.price))
}
let context =new Context();
let price =new Price();
context.set("普通用户",price,200);
context.getResult();
let vipPrice =new VipPrice();
context.set("vip用户",vipPrice,200);
context.getResult();
let superVipPrice =new SuperVipPrice();
context.set("超级vip用户",superVipPrice,200);
context.getResult();
