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小(xiao)锋(feng) 2023-05-22 14:05:34

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• 匿(ni)名用户  2023-05-22 14:05:34

  　　最常(chang)见(jian)的(de)(de)(de)(de)(de)(de)(de)设计(ji)(ji)(ji)模(mo)(mo)式(shi)(shi)(shi)(shi)(shi)之一(yi)(yi)是(shi)观察者模(mo)(mo)式(shi)(shi)(shi)(shi)(shi)，也称为(wei)(wei)发(fa)(fa)布-订阅模(mo)(mo)式(shi)(shi)(shi)(shi)(shi)。该模(mo)(mo)式(shi)(shi)(shi)(shi)(shi)是(shi)一(yi)(yi)种(zhong)一(yi)(yi)对(dui)(dui)(dui)多的(de)(de)(de)(de)(de)(de)(de)依赖关系，使得(de)多个(ge)对(dui)(dui)(dui)象(xiang)同(tong)时(shi)监听一(yi)(yi)个(ge)主(zhu)题对(dui)(dui)(dui)象(xiang)，当主(zhu)题对(dui)(dui)(dui)象(xiang)发(fa)(fa)生(sheng)变化时(shi)，所(suo)有(you)(you)(you)监听者都能够(gou)得(de)到通知并作(zuo)出相应(ying)(ying)(ying)的(de)(de)(de)(de)(de)(de)(de)反应(ying)(ying)(ying)。在(zai)Javascript中(zhong)(zhong)，观察者模(mo)(mo)式(shi)(shi)(shi)(shi)(shi)常(chang)见(jian)于(yu)事(shi)(shi)(shi)(shi)件(jian)处(chu)理(li)程序(xu)中(zhong)(zhong)，即将(jiang)(jiang)事(shi)(shi)(shi)(shi)件(jian)处(chu)理(li)程序(xu)注(zhu)册为(wei)(wei)监听器，以(yi)(yi)(yi)(yi)便(bian)在(zai)事(shi)(shi)(shi)(shi)件(jian)发(fa)(fa)生(sheng)时(shi)执行(xing)。另一(yi)(yi)个(ge)常(chang)见(jian)的(de)(de)(de)(de)(de)(de)(de)设计(ji)(ji)(ji)模(mo)(mo)式(shi)(shi)(shi)(shi)(shi)是(shi)命令(ling)(ling)模(mo)(mo)式(shi)(shi)(shi)(shi)(shi)，它(ta)将(jiang)(jiang)一(yi)(yi)个(ge)请求封装(zhuang)成一(yi)(yi)个(ge)对(dui)(dui)(dui)象(xiang)，并将(jiang)(jiang)该请求的(de)(de)(de)(de)(de)(de)(de)参数(shu)、方(fang)法(fa)和(he)(he)操(cao)作(zuo)保(bao)存(cun)在(zai)该对(dui)(dui)(dui)象(xiang)中(zhong)(zhong)。该模(mo)(mo)式(shi)(shi)(shi)(shi)(shi)的(de)(de)(de)(de)(de)(de)(de)优(you)(you)点在(zai)于(yu)可(ke)以(yi)(yi)(yi)(yi)将(jiang)(jiang)请求将(jiang)(jiang)与(yu)收到请求的(de)(de)(de)(de)(de)(de)(de)对(dui)(dui)(dui)象(xiang)解耦(ou)，同(tong)时(shi)也可(ke)以(yi)(yi)(yi)(yi)实现(xian)命令(ling)(ling)撤回、重做等(deng)功能。在(zai)Javascript中(zhong)(zhong)，常(chang)见(jian)的(de)(de)(de)(de)(de)(de)(de)应(ying)(ying)(ying)用(yong)(yong)(yong)是(shi)将(jiang)(jiang)动态交互元素的(de)(de)(de)(de)(de)(de)(de)事(shi)(shi)(shi)(shi)件(jian)封装(zhuang)成命令(ling)(ling)对(dui)(dui)(dui)象(xiang)，以(yi)(yi)(yi)(yi)实现(xian)用(yong)(yong)(yong)户(hu)的(de)(de)(de)(de)(de)(de)(de)控制操(cao)作(zuo)。还有(you)(you)(you)一(yi)(yi)个(ge)常(chang)用(yong)(yong)(yong)的(de)(de)(de)(de)(de)(de)(de)设计(ji)(ji)(ji)模(mo)(mo)式(shi)(shi)(shi)(shi)(shi)是(shi)策(ce)略(lve)模(mo)(mo)式(shi)(shi)(shi)(shi)(shi)，它(ta)定义了一(yi)(yi)组算法(fa)，将(jiang)(jiang)每个(ge)算法(fa)都封装(zhuang)起来(lai)，并使它(ta)们之间可(ke)以(yi)(yi)(yi)(yi)相互替换。该模(mo)(mo)式(shi)(shi)(shi)(shi)(shi)的(de)(de)(de)(de)(de)(de)(de)优(you)(you)点在(zai)于(yu)可(ke)以(yi)(yi)(yi)(yi)灵活地(di)选(xuan)择和(he)(he)应(ying)(ying)(ying)用(yong)(yong)(yong)算法(fa)，并通过选(xuan)择不(bu)同(tong)的(de)(de)(de)(de)(de)(de)(de)算法(fa)来(lai)改变对(dui)(dui)(dui)象(xiang)的(de)(de)(de)(de)(de)(de)(de)行(xing)为(wei)(wei)。在(zai)Javascript中(zhong)(zhong)，策(ce)略(lve)模(mo)(mo)式(shi)(shi)(shi)(shi)(shi)常(chang)用(yong)(yong)(yong)于(yu)处(chu)理(li)一(yi)(yi)系列不(bu)同(tong)的(de)(de)(de)(de)(de)(de)(de)交互行(xing)为(wei)(wei)，并根(gen)据不(bu)同(tong)的(de)(de)(de)(de)(de)(de)(de)用(yong)(yong)(yong)户(hu)操(cao)作(zuo)选(xuan)择不(bu)同(tong)的(de)(de)(de)(de)(de)(de)(de)处(chu)理(li)策(ce)略(lve)。此外，还有(you)(you)(you)其他许多事(shi)(shi)(shi)(shi)件(jian)设计(ji)(ji)(ji)模(mo)(mo)式(shi)(shi)(shi)(shi)(shi)，比如单例模(mo)(mo)式(shi)(shi)(shi)(shi)(shi)、组合(he)模(mo)(mo)式(shi)(shi)(shi)(shi)(shi)等(deng)。这些模(mo)(mo)式(shi)(shi)(shi)(shi)(shi)都有(you)(you)(you)其自身(shen)的(de)(de)(de)(de)(de)(de)(de)优(you)(you)点和(he)(he)应(ying)(ying)(ying)用(yong)(yong)(yong)场景，可(ke)以(yi)(yi)(yi)(yi)根(gen)据具体的(de)(de)(de)(de)(de)(de)(de)需求和(he)(he)情况选(xuan)择合(he)适的(de)(de)(de)(de)(de)(de)(de)模(mo)(mo)式(shi)(shi)(shi)(shi)(shi)。总之，通过使用(yong)(yong)(yong)这些事(shi)(shi)(shi)(shi)件(jian)设计(ji)(ji)(ji)模(mo)(mo)式(shi)(shi)(shi)(shi)(shi)，开发(fa)(fa)人(ren)员(yuan)可(ke)以(yi)(yi)(yi)(yi)更好地(di)理(li)解和(he)(he)管理(li)Javascript的(de)(de)(de)(de)(de)(de)(de)事(shi)(shi)(shi)(shi)件(jian)处(chu)理(li)，提高代码的(de)(de)(de)(de)(de)(de)(de)质(zhi)量和(he)(he)可(ke)维护性。

• 匿名(ming)用户  2023-05-22 14:05:34

  　　在(zai) JavaScript 中(zhong)，常用(yong)的(de)(de)事(shi)(shi)件(jian)(jian)(jian)相关(guan)的(de)(de)设计(ji)模式(shi)(shi)(shi)包括：1. 发布(bu)/订(ding)阅模式(shi)(shi)(shi)(Publish/Subscribe)：也称为观(guan)察者(zhe)模式(shi)(shi)(shi)，通(tong)(tong)过定义一个中(zhong)心事(shi)(shi)件(jian)(jian)(jian)管理(li)器(qi)来实现(xian)(xian)事(shi)(shi)件(jian)(jian)(jian)的(de)(de)订(ding)阅和发布(bu)，不同的(de)(de)组件(jian)(jian)(jian)可(ke)以(yi)订(ding)阅感兴趣的(de)(de)事(shi)(shi)件(jian)(jian)(jian)，并在(zai)事(shi)(shi)件(jian)(jian)(jian)发生时得到(dao)(dao)通(tong)(tong)知。2. 委托模式(shi)(shi)(shi)(Delegation)：也称为事(shi)(shi)件(jian)(jian)(jian)委托模式(shi)(shi)(shi)，通(tong)(tong)过将事(shi)(shi)件(jian)(jian)(jian)绑定到(dao)(dao)父元(yuan)素(su)上，利用(yong)事(shi)(shi)件(jian)(jian)(jian)冒泡(pao)机制来处(chu)(chu)理(li)子元(yuan)素(su)的(de)(de)事(shi)(shi)件(jian)(jian)(jian)，可(ke)以(yi)减少(shao)事(shi)(shi)件(jian)(jian)(jian)处(chu)(chu)理(li)程(cheng)序(xu)的(de)(de)数(shu)量，提(ti)高(gao)性能(neng)。3. 单例模式(shi)(shi)(shi)(Singleton)：用(yong)于创建唯(wei)一的(de)(de)事(shi)(shi)件(jian)(jian)(jian)管理(li)器(qi)或全局(ju)对(dui)象(xiang)，确保(bao)整个应用(yong)程(cheng)序(xu)中(zhong)只有一个实例存在(zai)，方便统一管理(li)事(shi)(shi)件(jian)(jian)(jian)。4. 装(zhuang)饰器(qi)模式(shi)(shi)(shi)(Decorator)：通(tong)(tong)过装(zhuang)饰器(qi)函数(shu)对(dui)事(shi)(shi)件(jian)(jian)(jian)处(chu)(chu)理(li)函数(shu)进行(xing)扩展(zhan)或增(zeng)强，实现(xian)(xian)额(e)外的(de)(de)功能(neng)，例如日志记录、性能(neng)监控等。5. 链(lian)式(shi)(shi)(shi)调用(yong)模式(shi)(shi)(shi)(Chaining)：通(tong)(tong)过在(zai)事(shi)(shi)件(jian)(jian)(jian)处(chu)(chu)理(li)函数(shu)中(zhong)返(fan)回当前对(dui)象(xiang)或者(zhe)事(shi)(shi)件(jian)(jian)(jian)管理(li)器(qi)实例，实现(xian)(xian)连续(xu)调用(yong)多个事(shi)(shi)件(jian)(jian)(jian)处(chu)(chu)理(li)函数(shu)，提(ti)高(gao)代码的(de)(de)可(ke)读(du)性和简(jian)洁性。

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