字符串处理
1. 生成随机字符串
const randomString = (length = 8) => { return Math.random().toString(36).slice(2, 2 + length);};// 示例：randomString() → "4f9d2fe3"
2. 首字母大写
const capitalize = (str) => { return str.charAt(0).toUpperCase() + str.slice(1);};// 示例：capitalize("hello") → "Hello"
数组操作
3. 数组去重
const uniqueArray = (arr) => [...new Set(arr)];// 示例：uniqueArray([1,2,2,3]) → [1,2,3]
4. 数组乱序(洗牌算法)
const shuffleArray = (arr) => { return arr.sort(() => Math.random() - 0.5);};// 示例：shuffleArray([1,2,3,4]) → 随机顺序
对象处理
5. 深拷贝(简易版)
const deepClone = (obj) => JSON.parse(JSON.stringify(obj));// 注意：无法复制函数和循环引用
6. 对象属性过滤
const filterObject = (obj, keys) => { return Object.fromEntries( Object.entries(obj).filter(([key]) => keys.includes(key)) );};// 示例：filterObject({a:1, b:2}, ['a']) → {a:1}
数字处理
7. 千分位格式化
const formatNumber = (num) => { return num.toString().replace(/\B(?=(\d{3})+(?!\d))/g, ",");};// 示例：formatNumber(1234567) → "1,234,567"
8. 生成范围随机数
const randomInRange = (min, max) => { return Math.floor(Math.random() * (max - min + 1)) + min;};// 示例：randomInRange(5, 10) → 5~10之间的整数
DOM 相关
9. 复制内容到剪贴板
const copyToClipboard = (text) => { navigator.clipboard.writeText(text);};
10. 检测元素是否可见
const isElementVisible = (el) => { return el.offsetParent !== null;};
日期处理
11. 格式化日期
const formatDate = (date = new Date(), format = 'YYYY-MM-DD') => { const pad = n => n.toString().padStart(2, '0'); return format .replace('YYYY', date.getFullYear()) .replace('MM', pad(date.getMonth() + 1)) .replace('DD', pad(date.getDate()));};// 示例：formatDate() → "2023-08-15"
函数优化
12. 防抖函数(Debounce)
const debounce = (fn, delay = 300) => { let timer; return (...args) => { clearTimeout(timer); timer = setTimeout(() => fn.apply(this, args), delay); };};// 适用场景：搜索框输入
13. 节流函数(Throttle)
const throttle = (fn, interval = 300) => { let lastTime = 0; return (...args) => { const now = Date.now(); if (now - lastTime >= interval) { fn.apply(this, args); lastTime = now; } };};// 适用场景：滚动事件
14. 类型判断增强版
const typeOf = (obj) => { return Object.prototype.toString.call(obj).slice(8, -1).toLowerCase();};// 示例：typeOf([]) → "array"
15. 本地存储封装
const storage = { set: (key, value) => localStorage.setItem(key, JSON.stringify(value)), get: (key) => { try { return JSON.parse(localStorage.getItem(key)); } catch (e) { return null; } }};
