前端设计模式
标签:
JavaScript
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。
// 工厂模式<script> function createPerson(opt){ var person = function(){ name = opt.name || 'huang' } person.sayName = function(){ console.log(this.name); } } var p1 = createPerson({name:'ruoyu'}); var p2 = createPerson({name:'饥人谷'})</script>// 构造函数模式<script> function Person(name,age){ this.name = name; this.age = age; } Person.prototype.sayName = function(){ return this.name; } var p1 = new Person('ruoyu',30); console.log(p1);</script>// 模块模式<script> var Person = (function(){ var name = 'ruoyu'; function sayName(){ return this.name; } return { name:name, sayName:sayName } })(); var p1 = Person.sayName; console.log(p1)</script>// 混合模式<script> var Person = function(name,age){ this.name = name; this.age = age; } Person.prototype.sayName = function(){ console.log(this.name) } var Student = function(name,age,score){ Person.call(this,name,age); this.score = score; } Student.prototype = create(Person.prototype); function create(parentObject){ function fn(){}; fn.prototype = parentObject; return new fn(); } Student.prototype.sayScore = function(){ console.log(this.score) } var student = new Student('ruoyu',30,90); console.log(student)</script>// 单例模式<script> var Person = (function(){ var instance; function init(){ //define private methods and properties //do something return { //define public methods and properties }; } return { createPerson:function(){ if(!instance){ instance = init(); } return instance; } } })() var p1 = Person.createPerson();</script>// 发布订阅模式<script> 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 < event[evt].lenght; i++){ events[evt][i].handler(args); } } return { on:on, fire:fire } })()</script>
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');// 实现事件管理器<script> var Event = (function(){ var events = {}; function on(evt,handle){ events[evt] = events[evt] || []; events[evt].push({ handle:handle }) } function fire(evt,arges){ if(!events[evt]){ return; } for(var i = 0; i < events[evt].length; i++){ events[evt][i].handle(arges); } } 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'); Event.off('changer');</script>
作者:饥人谷_米弥轮
链接:https://www.jianshu.com/p/814301e9c910
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