25 个杀手级 JavaScript 单行代码让你看起来像个专业人士
今天我将与你分享 25 个单行 JavaScript 代码片段，以提升你的 JavaScript 知识技能，并帮助你在开发中提升效率。
1. 将内容复制到剪贴板
const copyToClipboard = (content) => navigator.clipboard.writeText(content);
copyToClipboard("Hello fatfish");
2. 获取鼠标选择
const getSelectedText = () => window.getSelection().toString();
getSelectedText();
3. 打乱数组
const shuffleArray = (array) => array.sort(() => Math.random() - 0.5);
shuffleArray([1, 2, 3, 4, -1, 0]);
4. 将 rgba 转换为十六进制
const rgbaToHex = (r, g, b) => "#" + [r, g, b].map(num => parseInt(num).toString(16).padStart(2, '0')).join('');
rgbaToHex(0, 0, 0); // #000000
5. 将十六进制转换为 rgba
const hexToRgba = hex => {
const [r, g, b] = hex.match(/\w\w/g).map(val => parseInt(val, 16));
return `rgba(${r}, ${g}, ${b}, 1)`;
};
hexToRgba('#ff007f'); // rgba(255, 0, 127, 1)
6. 获取多个数字的平均值
const average = (...args) => args.reduce((a, b) => a + b, 0) / args.length;
average(0, 1, 2, -1, 9, 10); // 3.5
7. 检查数字是偶数还是奇数
const isEven = num => num % 2 === 0;
isEven(2); // true
8. 删除数组中的重复元素
const uniqueArray = (arr) => [...new Set(arr)];
uniqueArray([1, 1, 2, 3, 4, 5, -1, 0]); // [1, 2, 3, 4, 5, -1, 0]
9. 检查对象是否为空
const isEmpty = obj => Reflect.ownKeys(obj).length === 0 && obj.constructor === Object;
isEmpty({}); // true
10. 反转字符串
const reverseStr = str => str.split('').reverse().join('');
reverseStr('fatfish'); // hsiftaf
11. 计算两个日期之间的间隔
const dayDiff = (d1, d2) => Math.ceil(Math.abs(d1.getTime() - d2.getTime()) / 86400000);
dayDiff(new Date("2023-06-23"), new Date("1997-05-31")); // 9519
12. 找出日期所在的年份
const dayInYear = (d) => Math.floor((d - new Date(d.getFullYear(), 0, 0)) / 1000 / 60 / 60 / 24);
dayInYear(new Date('2023/06/23')); // 174
13. 将字符串的首字母大写
const capitalize = str => str.charAt(0).toUpperCase() + str.slice(1);
capitalize("hello fatfish"); // Hello fatfish
14. 生成指定长度的随机字符串
const generateRandomString = length => [...Array(length)].map(() => Math.random().toString(36)[2]).join('');
generateRandomString(12); // cysw0gfljoyx
15. 获取两个整数之间的随机整数
const random = (min, max) => Math.floor(Math.random() * (max - min + 1) + min);
random(1, 100); // 27
16. 指定数字四舍五入
const round = (n, d) => Number(Math.round(n + "e" + d) + "e-" + d);
round(3.1415926, 3); // 3.142
17. 清除所有 cookie
const clearCookies = document.cookie.split(';').forEach(cookie => document.cookie = cookie.replace(/^ +/, '').replace(/=.*/, `=;expires=${new Date(0).toUTCString()};path=/`));
18. 检测是否为暗模式
const isDarkMode = window.matchMedia && window.matchMedia('(prefers-color-scheme: dark)').matches;
console.log(isDarkMode);
19. 滚动到页面顶部
const goToTop = () => window.scrollTo(0, 0);
goToTop();
20. 确定是否为 Apple 设备
const isAppleDevice = () => /Mac|iPod|iPhone|iPad/.test(navigator.platform);
isAppleDevice();
21. 随机布尔值
const randomBoolean = () => Math.random() >= 0.5;
randomBoolean();
22. 获取变量的类型
const typeOf = (obj) => Object.prototype.toString.call(obj).slice(8, -1).toLowerCase();
typeOf(''); // string
23. 确定当前选项卡是否处于活动状态
const checkTabInView = () => !document.hidden;
24. 检查元素是否处于焦点
const isFocus = (ele) => ele === document.activeElement;
25. 随机 IP
const generateRandomIP = () => Array.from({length: 4}, () => Math.floor(Math.random() * 256)).join('.');
generateRandomIP(); // 220.187.184.113
总结
以上就是我今天与你分享的25个JS单行代码片段，记得收藏以备不时之需。希望这些代码片段对你有所帮助！