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

    //单例模式范例    var  Car = (function(){        var instance;        function init() {            //私有的变量和函数            var speed = 0;            return {                //定义公共的属性和方法                getSpeed: function(){                    return speed;                },                setSpeed: function( s ){                   speed = s;                }            };        }        return {            getInstance: function() {                if (!instance) {                    instance = init();                }                return instance;            }        };    }());    var car = Car.getInstance();    var car2 = Car.getInstance();    car === car2; //true

    //构造函数模式    function People(name){        this.name=name;    }    People.prototype.sayName=function(){        console.log('my name is '+this.name);    }    var people1=new People("zuo");    people1.sayName();

    //混合模式--继承    function People(name){        this.name=name;    }    People.prototype.sayName=function(){        console.log('my name is '+this.name);    }    function Male(name,sex){        People.call(null,name)        this.sex=sex;    }    Male.prototype=Object.create(People.prototype);    Male.prototype.getSex=function(){        return this.sex;    }    var people2=new Male("zuo","male");    people2.sayName();    people2.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('zuo',27);    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;  //改为age=age也不会报错，正常输出                },                getAge:function(){                    console.log(this.age);                }            }        }        var people3=People('zuo',22);        people3.sayName();        people3.getAge();        people3.setAge(27);        people3.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<events[evt].length;i++){                    events[evt][i].handler(arg)                }            }            function off(evt){              delete events[evt];            }            return {                on:on,                fire:fire                off:off            }        }())

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<events[evt].length;i++){            events[evt][i].handler(arg)        }    }    function off(evt){        delete events[evt];    }    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'); //change...  now val is 饥人谷Event.off('change');

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