一、用正则表达式来将字符串I?���love�??�the�?great�?�?wall�in��?beijing更改为:I love the Great Wall in Beijing,主要是为了解决编码的问题导致的问题,规律:
- 乱码只有两种特殊字符分别是
?和�; - 如果乱码的末尾是
?则它的下一位字母肯定是大写;
class stringReg { constructor(text) { this.text = text; this.init(); } getString() {//将符合规律2的单词首字母大写 const regArr = this.text.match(/[\?][a-z]/g); for (let i = 0; i < regArr.length; i++) { this.text = this.text.replace(regArr[i], regArr[i][1].toUpperCase()); } } trim() {//将多个空格转化为单个空格 this.text = this.text.replace(/\s\s*/g, ' '); } delSymbol() {//将特殊符号全部转化为空格 this.text = this.text.replace(/[\?\�]/g, ' '); } init() { this.getString(); this.delSymbol(); this.trim(); } } const { text } = new stringReg("I?���love�??�the�?great�?�?wall�in��?beijing"); console.log(text); //I love the Great Wall in Beijing二、不使用类似for,while循环控制语句和js本身自带方法(如:forEach)的情况下,实现将一个空数组[]赋值成[0,2,4,6,8,*****************]范围0-100便可。
//递归思想function evenNum(min = 0, max = 100, arr = []) { if (min % 2 === 0) { arr.push(min); } if (min === max) { return arr; } return evenNum(++min, max, arr);}console.log(evenNum(0, 6)); //[0, 2, 4, 6]三、设计一个自由可灵活配置的时间调度器,有a,b,c,d...很多个需要被调度的方法(方法名称的命名可随意),调度有两种形式,一个是顺序调用(例如调度完a后才能调度b),一个是间隔某个时间进行循环调度。用一个统一的方法进行封装可以实现下列的例子:
- 可以为5秒后调用a,3秒后调用b,7秒后调用c。d...z方法不执行(不执行的方法可以设计成不传递参数),那么在第14秒的时候开始重新从0秒循环,又变成5秒后调用a,3秒后调用b,7秒后调用c，这样循环往复;
- 每间隔6秒调用一次a,每间隔4秒调用一次b,c...z方法不执行;
- 第一秒先执行a,3秒后执行b,但是c却是每间隔3秒执行一次,d是每间隔4秒执行一次,a和b是每4秒进行一次循环;
- a不执行,b和c每间隔3秒执行一次,d不执行;
class TimeScheduler { constructor() { this.events = []; this.orderCallStack = []; this.ownCallStack = []; } //添加执行栈函数，orderExec用于区别是顺序调用还是独立调用，注意同一个函数存在顺序调用和独立调用时需要add两次 add(fn = () => {}, orderExec = false, timeout = 3) { let fnc; if (orderExec) { fnc = () => { setTimeout(() => { fn(); this.next(); }, timeout * 1000) }; } else { fnc = () => { setInterval(() => { fn() }, timeout * 1000) }; } this.events.push({ fnc, orderExec }) } remove(fnc = () => {}) { this.events = this.events.filter(item => item.fnc === fnc); } clear() { //清除存储数据及清空调用栈 this.events = []; this.orderCallStack.forEach(item => { clearTimeout(item.fnc); }); this.ownCallStack.forEach(item => { clearInterval(item.fnc); }); this.ownCallStack = []; this.orderCallStack = []; } start() { //开始执行 this.orderCallStack = this.events.filter(item => !!item.orderExec); this.ownCallStack = this.events.filter(item => !item.orderExec); this.ownCallStack.forEach(item => item.fnc()); this.next(); } stop() { //停止执行 this.orderCallStack.forEach(item => { clearTimeout(item.fnc); }); this.ownCallStack.forEach(item => { clearInterval(item.fnc); }); this.ownCallStack = []; this.orderCallStack = []; } next() { //顺序调用栈执行函数 let obj = this.orderCallStack.shift() || {}; if (obj.fnc) { this.orderCallStack.push(obj); obj.fnc(); } }}例1使用示例：
let a = () => { console.log("a");}let b = () => { console.log("b");}let c = () => { console.log("c");}const timeScheduler1 = new TimeScheduler();timeScheduler1.add(a, true, 5);timeScheduler1.add(b, true, 3);timeScheduler1.add(c, true, 7);timeScheduler1.start();console.log(timeScheduler1);