现在，我们就开始进入今天的内容。
1.复制内容到剪贴板
const copyToClipboard = (text) => navigator.clipboard.writeText(text);
copyToClipboard("Hello World");
2.清除所有cookie
const clearCookies = document.cookie.split(';').forEach(cookie => document.cookie = cookie.replace(/^ +/, '').replace(/=.*/, `=;expires=${new Date(0).toUTCString()};path=/`));
3.获取选中的文字
const getSelectedText = () => window.getSelection().toString();
getSelectedText();
4.滚动到页面顶部
const goToTop = () => window.scrollTo(0, 0);
goToTop();
5.判断当前tab是否激活
const isTabInView = () => !document.hidden;
6.判断当前设备是否为苹果设备
const isAppleDevice = () => /Mac|iPod|iPhone|iPad/.test(navigator.platform);
isAppleDevice();
7.是否滚动到页面底部
const scrolledToBottom = () => document.documentElement.clientHeight + window.scrollY >= document.documentElement.scrollHeight;
8. 重定向到一个 URL
const redirect = url => location.href = url
redirect("https://www.google.com/")
9.打开浏览器打印框
const showPrintDialog = () => window.print()
10.随机布尔
const randomBoolean = () => Math.random() >= 0.5;
randomBoolean();
11.变量交换
[foo, bar] = [bar, foo];
12.获取变量的类型
const trueTypeOf = (obj) => Object.prototype.toString.call(obj).slice(8, -1).toLowerCase();
trueTypeOf(''); // string
trueTypeOf(0); // number
trueTypeOf(); // undefined
trueTypeOf(null); // null
trueTypeOf({}); // object
trueTypeOf([]); // array
trueTypeOf(0); // number
trueTypeOf(() => {}); // function
13.检查对象是否为空
const isEmpty = obj => Reflect.ownKeys(obj).length === 0 && obj.constructor === Object;
14.检查日期是否有效
const isDateValid = (...val) => !Number.isNaN(new Date(...val).valueOf());
isDateValid("December 17, 2022 03:24:00");
15.计算两个日期之间的间隔
const dayDif = (date1, date2) => Math.ceil(Math.abs(date1.getTime() - date2.getTime()) / 86400000)
dayDif(new Date("2022-11-3"), new Date("2023-2-1"));
16. 找出日期所在年份中的第几天
const dayOfYear = (date) => Math.floor((date - new Date(date.getFullYear(), 0, 0)) / 1000 / 60 / 60 / 24);
dayOfYear(new Date());
17.时间格式化
const timeFromDate = date => date.toTimeString().slice(0, 8);
timeFromDate(new Date(2022, 11, 2, 12, 30, 0));
timeFromDate(new Date());
18.将字符串首字母大写
const capitalize = str => str.charAt(0).toUpperCase() + str.slice(1)
capitalize("hello world")
19.翻转字符串
const reverse = str => str.split('').reverse().join('');
reverse('hello world');
20.随机字符串
const randomString = () => Math.random().toString(36).slice(2);
randomString();
21. 截断字符串
const truncateString = (string, length) => string.length < length ? string : `${string.slice(0, length - 3)}...`;
truncateString('Hi, I am too loooong!', 12);
22. 从字符串中删除 HTML
const stripHtml = html => (new DOMParser().parseFromString(html, 'text/html')).body.textContent || '';
23. 删除数组中的重复项
const removeDuplicates = (arr) => [...new Set(arr)];
console.log(removeDuplicates([1, 2, 2, 3, 3, 4, 4, 5, 5, 6]));
24.检查数组是否为空
const isNotEmpty = arr => Array.isArray(arr) && arr.length > 0;
isNotEmpty([1, 2, 3]);
25.合并两个数组
const merge = (a, b) => a.concat(b);
const merge = (a, b) => [...a, ...b];
26.判断一个数是奇数还是偶数
const isEven = num => num % 2 === 0;
isEven(1024);
27. 求一组数的平均值
const average = (...args) => args.reduce((a, b) => a + b) / args.length;
average(1, 2, 3, 4, 5);
28. 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, 50);
29.四舍五入到指定位数
const round = (n, d) => Number(Math.round(n + "e" + d) + "e-" + d)
round(1.005, 2);
round(1.555, 2);
写在最后
以上就是我今天整理的29个关于JavaScript的单行代码技巧，希望这些技巧对你有用，如果你觉得有帮助的话，请点赞我，关注我，这样，你将会获取到更多有价值的内容与信息。
最后，感谢你的阅读，快乐学习，开心编程。
