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:
1,乱码只有两种特殊字符分别是‘?‘和‘?‘;
2,如果乱码的末尾是‘?‘则它的下一位字母肯定是大写;
let str = "I????love????the??great????wall?in???beijing"; str = str.replace(/?/g, ‘‘); console.log(str); strArr = str.split(‘?‘); for(var i=0;i<strArr.length;i++){ strArr[i] = strArr[i].charAt(0).toUpperCase()+strArr[i].slice(1); } strArr = strArr.join(‘ ‘); console.log(strArr);
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,******************],范围0-100便可。
let arr = [];
let num = 0;
function addNum2Arr() {
if (num<100) {
arr.push(num);
num += 4;
addNum2Arr();
}
}
addNum2Arr();
console.log(arr)
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:
1,可以为5秒后调用a,3秒后调用b,10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,又变成第一秒后调用a,3秒后调用b,这样循环往复;
2,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;
3,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;
4,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();
}
}
}
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, 10);
timeScheduler1.start();
参考 https://cloud.tencent.com/developer/article/1637007
原文：https://www.cnblogs.com/fairy62/p/13110761.html