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function debounce(func, delay) {let timer;return function() {const context = this;const args = arguments; ? ?clearTimeout(timer); ? ?timer = setTimeout(() => { ? ? ?func.apply(context, args); ? ?}, delay); ?};}

<input type="text" id="searchInput">

const input = document.getElementById('searchInput');function search() {console.log('Searching...');}input.addEventListener('input', debounce(search, 500));

function deepCopy(obj) {if (obj === null || typeof obj!== 'object') {return obj; ? ? }let copy;if (Array.isArray(obj)) { ? ? ? copy = [];for (let i = 0; i < obj.length; i++) { ? ? ? ? copy[i] = deepCopy(obj[i]); ? ? ? } ? ? } else { ? ? ? copy = {};for (let key in obj) {if (obj.hasOwnProperty(key)) { ? ? ? ? ? copy[key] = deepCopy(obj[key]); ? ? ? ? } ? ? ? } ? ? }return copy; ? }

const originalObject = { a: 1, b: { c: 2 } };const copiedObject = JSON.parse(JSON.stringify(originalObject));

function throttle(func, delay) {let lastTime = 0;let timer = null;return function() {const now = Date.now();const context = this;const args = arguments;if (now - lastTime > delay) { ? ? ? ? func.apply(context, args); ? ? ? ? lastTime = now; ? ? ? } else if (!timer) { ? ? ? ? timer = setTimeout(() => { ? ? ? ? ? func.apply(context, args); ? ? ? ? ? timer = null; ? ? ? ? ? lastTime = Date.now(); ? ? ? ? }, delay); ? ? ? } ? ? }; ? }

function throttle(func, delay) {let isThrottled = false;let timer = null;return function() {const context = this;const args = arguments;if (!isThrottled) { ? ? ? ? func.apply(context, args); ? ? ? ? isThrottled = true; ? ? ? ? setTimeout(() => { ? ? ? ? ? isThrottled = false; ? ? ? ? }, delay); ? ? ? } else if (!timer) { ? ? ? ? timer = setTimeout(() => { ? ? ? ? ? func.apply(context, args); ? ? ? ? ? timer = null; ? ? ? ? }, delay); ? ? ? } ? ? }; ? }

window.addEventListener('scroll', throttle(function() {// 執(zhí)行滾動(dòng)事件處理函數(shù) ? }, 200));

document.addEventListener('mousemove', throttle(function(event) {// 執(zhí)行鼠標(biāo)移動(dòng)事件處理函數(shù) ? }, 50));

const input = document.getElementById('searchInput'); ? input.addEventListener('input', throttle(function() {const query = input.value;// 執(zhí)行搜索函數(shù) ? }, 300));

class MyPromise {constructor(executor) {this.state = 'pending';this.value = undefined;this.reason = undefined;this.onFulfilledCallbacks = [];this.onRejectedCallbacks = [];
const resolve = (value) => {if (this.state === 'pending') {this.state = 'fulfilled';this.value = value;this.onFulfilledCallbacks.forEach((callback) => callback(this.value)); ? ? ?} ? ?};
const reject = (reason) => {if (this.state === 'pending') {this.state = 'rejected';this.reason = reason;this.onRejectedCallbacks.forEach((callback) => callback(this.reason)); ? ? ?} ? ?};
try { ? ? ?executor(resolve, reject); ? ?} catch (error) { ? ? ?reject(error); ? ?} ?}
 ?then(onFulfilled, onRejected) { ? ?onFulfilled = typeof onFulfilled === 'function'? onFulfilled : (value) => value; ? ?onRejected = typeof onRejected === 'function'? onRejected : (reason) => { throw reason; };
let promise2 = new MyPromise((resolve, reject) => {if (this.state === 'fulfilled') { ? ? ? ?setTimeout(() => {try {let x = onFulfilled(this.value); ? ? ? ? ? ?resolvePromise(promise2, x, resolve, reject); ? ? ? ? ?} catch (error) { ? ? ? ? ? ?reject(error); ? ? ? ? ?} ? ? ? ?}, 0); ? ? ?} else if (this.state === 'rejected') { ? ? ? ?setTimeout(() => {try {let x = onRejected(this.reason); ? ? ? ? ? ?resolvePromise(promise2, x, resolve, reject); ? ? ? ? ?} catch (error) { ? ? ? ? ? ?reject(error); ? ? ? ? ?} ? ? ? ?}, 0); ? ? ?} else {this.onFulfilledCallbacks.push((value) => { ? ? ? ? ?setTimeout(() => {try {let x = onFulfilled(value); ? ? ? ? ? ? ?resolvePromise(promise2, x, resolve, reject); ? ? ? ? ? ?} catch (error) { ? ? ? ? ? ? ?reject(error); ? ? ? ? ? ?} ? ? ? ? ?}, 0); ? ? ? ?});this.onRejectedCallbacks.push((reason) => { ? ? ? ? ?setTimeout(() => {try {let x = onRejected(reason); ? ? ? ? ? ? ?resolvePromise(promise2, x, resolve, reject); ? ? ? ? ? ?} catch (error) { ? ? ? ? ? ? ?reject(error); ? ? ? ? ? ?} ? ? ? ? ?}, 0); ? ? ? ?}); ? ? ?} ? ?});
return promise2; ?}
catch(onRejected) {return this.then(null, onRejected); ?}}
function resolvePromise(promise2, x, resolve, reject) {if (promise2 === x) {return reject(new TypeError('Chaining cycle detected for promise')); ?}let called = false;if (x instanceof MyPromise) { ? ?x.then((y) => { ? ? ?resolvePromise(promise2, y, resolve, reject); ? ?}, reject); ?} else if (x!== null && (typeof x === 'object' || typeof x === 'function')) {try {let then = x.then;if (typeof then === 'function') { ? ? ? ?then.call(x, (y) => {if (called) return; ? ? ? ? ?called = true; ? ? ? ? ?resolvePromise(promise2, y, resolve, reject); ? ? ? ?}, (r) => {if (called) return; ? ? ? ? ?called = true; ? ? ? ? ?reject(r); ? ? ? ?}); ? ? ?} else { ? ? ? ?resolve(x); ? ? ?} ? ?} catch (e) {if (called) return; ? ? ?called = true; ? ? ?reject(e); ? ?} ?} else { ? ?resolve(x); ?}}

let myPromise = new MyPromise((resolve, reject) => { ?setTimeout(() => { ? ?resolve('Success!'); ?}, 1000);});
myPromise.then((value) => {console.log(value);return 'Another value';}).then((value) => {console.log(value);});

function asyncFunctionWithConcurrencyLimit(asyncFunctions, concurrencyLimit) {let inFlightCount = 0;let results = [];let index = 0;
function executeNext() {if (index < asyncFunctions.length && inFlightCount < concurrencyLimit) { ? ? ?inFlightCount++;const currentIndex = index; ? ? ?index++;const asyncFunc = asyncFunctions[currentIndex]; ? ? ?asyncFunc().then((result) => { ? ? ? ?results[currentIndex] = result; ? ? ? ?inFlightCount--; ? ? ? ?executeNext(); ? ? ?}).catch((error) => { ? ? ? ?results[currentIndex] = error; ? ? ? ?inFlightCount--; ? ? ? ?executeNext(); ? ? ?}); ? ?} ?}
for (let i = 0; i < concurrencyLimit && i < asyncFunctions.length; i++) { ? ?executeNext(); ?}
return new Promise((resolve, reject) => {const interval = setInterval(() => {if (results.length === asyncFunctions.length) { ? ? ? ?clearInterval(interval); ? ? ? ?resolve(results); ? ? ?} ? ?}, 100); ?});}

// 模擬一些異步函數(shù)function asyncTask(index) {return new Promise((resolve, reject) => { ? ?setTimeout(() => { ? ? ?resolve(`Task ${index} completed`); ? ?}, Math.random() * 2000); ?});}});
const tasks = Array.from({ length: 10 }, (_, index) => asyncTask(index));const concurrencyLimit = 3;
asyncFunctionWithConcurrencyLimit(tasks, concurrencyLimit).then((results) => {console.log(results);

function Parent() { ? ? this.parentProperty = 'parent value'; ? } ? Parent.prototype.parentMethod = function() { ? ? console.log('This is a parent method.'); ? }; ? function Child() {} ? Child.prototype = new Parent(); ? const child = new Child(); ? console.log(child.parentProperty); // 'parent value' ? child.parentMethod(); // 'This is a parent method.'

function Parent(name) { ? ? this.parentProperty = 'parent value'; ? ? this.name = name; ? } ? function Child(name) { ? ? Parent.call(this, name); ? ? this.childProperty = 'child value'; ? } ? const child = new Child('child name'); ? console.log(child.parentProperty); // 'parent value' ? console.log(child.name); // 'child name'

function Parent(name) { ? ? this.parentProperty = 'parent value'; ? ? this.name = name; ? } ? Parent.prototype.parentMethod = function() { ? ? console.log('This is a parent method.'); ? }; ? function Child(name) { ? ? Parent.call(this, name); ? ? this.childProperty = 'child value'; ? } ? Child.prototype = new Parent(); ? Child.prototype.constructor = Child; ? const child = new Child('child name'); ? console.log(child.parentProperty); // 'parent value' ? console.log(child.name); // 'child name'???child.parentMethod();?//?'This?is?a?parent?method.

 function inheritPrototype(child, parent) { ? ? const prototype = Object.create(parent.prototype); ? ? prototype.constructor = child; ? ? child.prototype = prototype; ? } ? function Parent(name) { ? ? this.parentProperty = 'parent value'; ? ? this.name = name; ? } ? Parent.prototype.parentMethod = function() { ? ? console.log('This is a parent method.'); ? }; ? function Child(name) { ? ? Parent.call(this, name); ? ? this.childProperty = 'child value'; ? } ? inheritPrototype(Child, Parent); ? const child = new Child('child name'); ? console.log(child.parentProperty); // 'parent value' ? console.log(child.name); // 'child name' ? child.parentMethod(); // 'This is a parent method.'

 const numbers = [4, 2, 5, 1, 3]; ? const sortedNumbers = numbers.sort(); ? console.log(sortedNumbers); // [1, 2, 3, 4, 5]

 const numbers = [4, 2, 5, 1, 3]; ? const sortedNumbers = numbers.sort((a, b) => b - a); ? console.log(sortedNumbers); // [5, 4, 3, 2, 1]

 const people = [ ? ? { name: 'Alice', age: 30 }, ? ? { name: 'Bob', age: 25 }, ? ? { name: 'Charlie', age: 35 } ? ]; ? const sortedPeople = people.sort((a, b) => a.age - b.age); ? console.log(sortedPeople); ? // [ ? // ? { name: 'Bob', age: 25 }, ? // ? { name: 'Alice', age: 30 }, ? // ? { name: 'Charlie', age: 35 } ? // ]

const people = [ ? ? { name: 'Alice', age: 30 }, ? ? { name: 'Bob', age: 25 }, ? ? { name: 'Charlie', age: 30 }, ? ? { name: 'David', age: 25 } ? ]; ? const sortedPeople = people.sort((a, b) => { ? ? if (a.age!== b.age) { ? ? ? return a.age - b.age; ? ? } else { ? ? ? return a.name.localeCompare(b.name); ? ? } ? }); ? console.log(sortedPeople); ? // [ ? // ? { name: 'Bob', age: 25 }, ? // ? { name: 'David', age: 25 }, ? // ? { name: 'Alice', age: 30 }, ? // ? { name: 'Charlie', age: 30 } ? // ]

const fruits = ['apple', 'banana', 'cherry', 'date']; ? const sortedFruits = fruits.sort((a, b) => { ? ? if (a.length!== b.length) { ? ? ? return a.length - b.length; ? ? } else { ? ? ? return a.localeCompare(b); ? ? } ? }); ? console.log(sortedFruits); ? // ['date', 'apple', 'cherry', 'banana']

 const arr = [1, 2, 2, 3, 4, 4, 5]; ? const uniqueArr = [...new Set(arr)];???console.log(uniqueArr);?//?[1,?2,?3,?4,?5]

const arr = [1, 2, 2, 3, 4, 4, 5]; ? const uniqueArr = []; ? for (let i = 0; i < arr.length; i++) { ? ? if (uniqueArr.indexOf(arr[i]) === -1) { ? ? ? uniqueArr.push(arr[i]); ? ? } ? } ? console.log(uniqueArr); // [1, 2, 3, 4, 5]

const arr = [1, 2, 2, 3, 4, 4, 5]; ? const uniqueArr = []; ? arr.forEach(item => { ? ? if (!uniqueArr.includes(item)) { ? ? ? uniqueArr.push(item); ? ? } ? }); ? console.log(uniqueArr); // [1, 2, 3, 4, 5]

 const arr = [1, 2, 2, 3, 4, 4, 5]; ? const uniqueArr = arr.reduce((acc, item) => { ? ? if (!acc.includes(item)) { ? ? ? acc.push(item); ? ? } ? ? return acc; ? }, []); ? console.log(uniqueArr); // [1, 2, 3, 4, 5]

const arr = [1, 2, 2, 3, 4, 4, 5]; ? const uniqueArr = []; ? const temp = {}; ? arr.forEach(item => { ? ? if (!temp[item]) { ? ? ? temp[item] = true; ? ? ? uniqueArr.push(item); ? ? } ? }); ? console.log(uniqueArr); // [1, 2, 3, 4, 5]

function getUrlParams(url) { ? ? const params = {}; ? ? const regex = /[?&]([^=#]+)=([^&#]*)/g; ? ? let match; ? ? while ((match = regex.exec(url))!== null) { ? ? ? params[match[1]] = decodeURIComponent(match[2]); ? ? } ? ? return params; ? } ? const url = 'https://example.com/page?param1=value1¶m2=value2'; ? const params = getUrlParams(url); ? console.log(params); // {param1: "value1", param2: "value2"}

const url = 'https://example.com/page?param1=value1¶m2=value2'; ? const urlParams = new URLSearchParams(url.split('?')[1]); ? const params = {}; ? for (const [key, value] of urlParams.entries()) { ? ? params[key] = value; ? } ? console.log(params); // {param1: "value1", param2: "value2"}

function getUrlParams(url) { ? ? const params = {}; ? ? const queryString = url.split('?')[1]; ? ? if (!queryString) return params; ? ? const pairs = queryString.split('&'); ? ? for (let i = 0; i < pairs.length; i++) { ? ? ? const pair = pairs[i].split('='); ? ? ? const key = decodeURIComponent(pair[0]); ? ? ? const value = decodeURIComponent(pair[1]); ? ? ? params[key] = value; ? ? } ? ? return params; ? } ? const url = 'https://example.com/page?param1=value1¶m2=value2'; ? const params = getUrlParams(url); ? console.log(params); // {param1: "value1", param2: "value2"}

const eventCenter = { ? ? events: {}, ? ? subscribe(eventName, callback) { ? ? ? if (!this.events[eventName]) { ? ? ? ? this.events[eventName] = []; ? ? ? } ? ? ? this.events[eventName].push(callback); ? ? }, ? ? publish(eventName, data) { ? ? ? if (this.events[eventName]) { ? ? ? ? this.events[eventName].forEach(callback => callback(data)); ? ? ? } ? ? }, ? ? unsubscribe(eventName, callback) { ? ? ? if (this.events[eventName]) { ? ? ? ? this.events[eventName] = this.events[eventName].filter(cb => cb!== callback); ? ? ? } ? ? } ? };

class EventEmitter { ? ? constructor() { ? ? ? this.events = {}; ? ? } ? ? subscribe(eventName, callback) { ? ? ? if (!this.events[eventName]) { ? ? ? ? this.events[eventName] = []; ? ? ? } ? ? ? this.events[eventName].push(callback); ? ? } ? ? publish(eventName, data) { ? ? ? if (this.events[eventName]) { ? ? ? ? this.events[eventName].forEach(callback => callback(data)); ? ? ? } ? ? } ? ? unsubscribe(eventName, callback) { ? ? ? if (this.events[eventName]) { ? ? ? ? this.events[eventName] = this.events[eventName].filter(cb => cb!== callback); ? ? ? } ? ? } ? }

ventCenter.subscribe('eventName', (data) => { ? ? console.log(`Received event "${eventName}" with data: ${data}`); ? });

 ? eventCenter.publish('eventName', 'event data');

const callback = (data) => { ? ? console.log(`Received event "${eventName}" with data: ${data}`); ? }; ? eventCenter.subscribe('eventName', callback); ? eventCenter.unsubscribe('eventName', callback);