作用:
将对象的行为和状态进行分离,状态是由行为操作决定的,而不是直接控制。
同时,行为也是由状态决定的,每个状态都有自己的行为和相应的方法
行为与状态分离,可以使代码方便维护
示例:
<!DOCTYPE html>
<html lang="en"><head><meta charset="UTF-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><title>状态模式</title>
</head><body><button onclick="wjtUseCom1()">王惊涛上机</button><button onclick="swkUseCom1()">孙悟空上机</button><button onclick="wjtAddTime()">王惊涛续费</button><button onclick="aheadClose()">王惊涛提前下机</button><script>//网吧上网//电脑类class Computer {constructor(code) {this.code = code}useName = nullstatus = 'close'useTime = 0canUseTime = 0//快没钱了warning() {this.status = 'warning'console.log(`${this.code}警告:尊敬的${this.useName}先生/女士,您的余额所剩不多,请到台前及时充值,当前状态${this.status}`)}//到时关闭或者提前下机close(name,useFun) {if(name !== this.useName){console.log(`你不是机器使用者,无权关闭`)return }this.status = 'close'this.canUseTime = 0this.useTime = 0if(useFun){clearInterval(useFun)useFun = null}console.log('到时间了,当前状态:' + this.status)}//续费addTime(addTime,name) {if(name !== this.useName){console.log(`你充错机器了吧,现在这台机器是${this.useName}在使用`)return }this.status = 'using'this.canUseTime += addTimeconsole.log('续费成功,当前状态' + this.status)}useCom = function (name, canUseTime) {if (this.status !== 'close') {console.log(`不好意思:${name}先生/女士${this.code}正在被${this.useName}使用,请你换一台`)return}this.useName = namethis.status = 'using' //开机使用console.log(`${name}开始使用${this.code},当前状态:${this.status}`)this.canUseTime = canUseTimelet useFun = setInterval(() => {if(this.status === 'close'){clearInterval(useFun)useFun = nullthis.canUseTime = 0this.useTime = 0return}this.useTime += 1000console.log(`已经使用${this.useTime}了,还剩${this.canUseTime - this.useTime}`)if (this.canUseTime - this.useTime === 5000) { //时间不多了,警告提示this.warning()}if (this.useTime === this.canUseTime) {this.close(this.useName,useFun) //时间到了,关闭}}, 1000)}}let computer1 = new Computer('1号机器')let wjt = '王惊涛'let sunwukong = '孙悟空'const wjtUseCom1 = ()=>{computer1.useCom(wjt, 10000)}const swkUseCom1 = ()=>{computer1.useCom(sunwukong, 10000)}const wjtAddTime = ()=>{computer1.addTime(10000,'王惊涛')}const aheadClose = ()=>{computer1.close('王惊涛')}</script>
</body></html>
