前端设计模式

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。

    //单例模式
 var Car = (function () {
      var instance;
      function init() {
        var speed = 0;
        return {
          getSpeed: function () {
            return speed;
          },
          setSpeed: function (val) {
            speed = val;
          }
        }
      }
        return {
          getInstance: function () {
            if (!instance) {
              instance = init();
              console.log(instance);
            }
            return instance;
          }
        };
    }())
    var car = Car.getInstance();
    var car2 = Car.getInstance();

    //构造函数模式
    function People(name){
      this.name=name;
    }
    People.prototype.sayName=function(){
      console.log("my name is"+this.name);
    }
    var people=new People("haha");
    people.sayName();

    //混合模式
   function People(name) {
      this.name = name;
      this.sayName = function () {
        console.log("my name is " + this.name);
      }
    }
    function Male(name, sex) {
      People.call(this, name);
      this.sex = sex;
    }
    Male.prototype.getSex = function () {
      console.log(this.sex);
      return this.sex;
    }
    var people = new Male("haha", "male");
    people.sayName();
    people.getSex();

    //模块模式
    var People=(function(){
      var people={
        init:function(name,age){
          this.name=name;
          this.age=age;
        },
        sayName:function(){
          console.log("my name is"+this.name);
        },
        setAge:function(age){
          return this.age=age;
        },
        getAge:function(){
          console.log(this.age);
        }
      };
      return people;
    }())
    People.init('haha',24);
    People.sayName();
    People.setAge(21);
    People.getAge();

    //工厂模式
    var People=function(name,age){
      return {
        name:name,
        age:age,
        sayName:function(){
          console.log("my name is"+this.name);
        },
        setAge:function(age){
          this.age=age;
        },
        getAge:function(){
          console.log(this.age);
        }
      }
    }
    var people=People('haha',22);
        people.sayName();
        people.getAge();
        people.setAge(27);
        people.getAge();

        //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,arg){
            if(!events[evt]){
              return 
            }
            for(var i=0;i

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

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

 var Event=(function(){
      var events={};
      function on(evt,handler){
        events[evt]=events[evt]||[];
        events[evt].push({
          handler:handler
        })
      }
      function fire(evt,arg){
        if(!events[evt]){
          return 
        }
        for(var i=0;i