装饰器模式
(function(){//装饰一棵树,装饰器模式通过对对象的属性进行改变来装饰对象。需要一个设置属性的方法
var tree={};
tree.decorate=function(){
print("Make sure the tree won\'t fall");
}; tree.getDecorator=function(deco){
tree[deco].prototype=this;
return new tree[deco];
}; tree.RedBalls=function(){
this.decorate=function(){
this.RedBalls.prototype.decorate();
print("Put on some red balls");
}
}; tree.BlueBalls=function(){
this.decorate=function(){
this.BlueBalls.prototype.decorate();
print("Add Blue Balls");
}
}; tree.Angle=function(){
this.decorate=function(){
this.Angle.prototype.decorate();
print("An angel on the top");
}
}; tree=tree.getDecorator("BlueBalls");
tree=tree.getDecorator("RedBalls");
tree=tree.getDecorator("Angle");
tree.decorate();
})();
观察者模式
(function(){ //观察者模式
var observer={
addSubscribe:function(callback){
this.subscribers[this.subscribers.length]=callback;
},
removeSubscrible:function(callback){
for(var i=0;i<this.subscribers.length;i++){
if(this.subscribers[i]===callback){
delete(this.subscribers[i]);
}
}
},
publish:function(what){
for(var i=0;i<this.subscribers.length;i++){
if(typeof this.subscribers[i]==="function"){
this.subscribers[i](what);
}
}
},
make:function(o){
for(var i in this){
o[i]=this[i];
o.subscribers=[];
}
}
}; //发布者
var blogger={
writeBlogPost:function(){
var content="Today is "+new Date();
this.publish(content);
}
} var la_time={
newIssue:function(){
var paper="Martians have landed on Earth!";
this.publish(paper);
}
}; observer.make(la_time);
observer.make(blogger);
//订阅者
var jack={
read:function(what){
print("I just read " + what);
}
}; var jill={
gossip:function(what){
print("You can not heard it from me but "+what);
}
}
//增加订阅者
blogger.addSubscribe(jack.read);
blogger.addSubscribe(jill.gossip);
blogger.writeBlogPost();
//删除订阅者
blogger.removeSubscrible(jill.gossip);
blogger.writeBlogPost(); la_time.addSubscribe(jill.gossip);
la_time.newIssue();
})();