1. 写出 构造函数模式、混合模式、模块模式、工厂模式、单例模式、发布订阅模式的范例。

• 构造函数模式

 function Person(name){
    this.name=name;
  }
p1 = new Person("小明");
console.log(p1.name)

• 混合模式

//用于实现继承
var Person = function (name,age){
    this.name=name;
    this.age=age;
  }
var Student = function(name,age,sid){
    Person.call(this,name,age);
    this.sid=sid;
}
s1 = new Student("小明","12","007")
 console.log(s1.name)

• 模块模式

//使用闭包来实现作用域的隔离
var Person = (function(){ 
    var name = '小明'; 
    function sayName(){ 
        console.log(name); 
    };

return {
 name: name, 
sayName: sayName
 } 
})(); 

• 工厂模式

function createpeople(name){
  var Person = {
    name:name,
    sayName : function(){
      console.log(this.name);
    }
  }
return Person;
}
var p1 = createpeople('小明')
      p2 = createpeople('小红')
p1.sayName();
p2.sayName();

• 单例模式

var person = (function(){
      var instance;
      function init(name){
      return {name:name}
    }
    return createpeople : function(name){
        if(!instance){
          instance=init(name);
        }
    return instance;
    }
}());

• 发布订阅模式

var EventCenter = (function(){
    var events = {};

    function on(evt,handler){
        events[evt] = events[evt] || [];
        events[evt].push({

            handler:handler
        });
    }

    function fire(evt,args){
        if(!events[evt]){
            return;
        }
        for(var i=0;i<events[evt].length;i++){
            events[evt][i].handler(args);
        }

    }

    return{
        on:on,
        fire:fire
    }
})();

EventCenter.on('my_event',function(data){
    console.log('my_event receive...')
});
EventCenter.fire('my_event');

2. 使用发布订阅模式写一个事件管理器，可以实现如下方式调用

var EventCenter = (function(){
    var events = {};

    function on(evt,handler){
        events[evt] = events[evt] || [];
        events[evt].push({
            handler:handler
        });
    }
  function off(evt){
        delete events[evt]
    }
    function fire(evt,args){
        if(!events[evt]){
            return;
        }
        for(var i=0;i<events[evt].length;i++){
            events[evt][i].handler(args);
        }

    }

    return{
        on:on,
        fire:fire，
        off:off
    }
})();
Event.on('change', function(val){
    console.log('change...  now val is ' + val);  
});
Event.fire('change', '饥人谷');
Event.off('changer');