宝藏级10个 JavaScript 短代码

1、获取浏览器Cookie的值
const cookie = name => ; ${document.cookie}.split(; ${name}=).pop().split(';').shift();
示例：cookie('token');

2、检查日期是否合法
const isDateValid = (...val) => !Number.isNaN(new Date(...val).valueOf());

示例：isDateValid("December 11, 2022 10:24:00");

3、英文字符串首字母大写
const capitalize = str => str.charAt(0).toUpperCase() + str.slice(1)

示例：capitalize("follow for more")

4、数组去重
const removeDuplicates = (arr) => [...new Set(arr)];

示例：removeDuplicates([1, 2, 3, 3, 4, 4, 5, 5, 6]);

5、时间处理
const timeFromDate = date => date.toTimeString().slice(0, 8);

示例：timeFromDate(new Date(2021, 0, 10, 17, 30, 0));

6、回顶部
const goToTop = () => window.scrollTo(0, 0);

goToTop();

7、字符串反向
const reverse = str => str.split('').reverse().join('');

示例：reverse('hello world');

8、奇偶数检测
const isEven = num => num % 2 === 0;

console.log(isEven(2)); // ture

9、计算两个日期之间相差的天数
const dayDif = (date1, date2) => Math.ceil(Math.abs(date1.getTime() - date2.getTime()) / 86400000)

dayDif(new Date("2020-10-21"), new Date("2021-10-22")) // 366

10、复制文本到剪切板
const copyToClipboard = (text) => navigator.clipboard.writeText(text);

copyToClipboard("Hello World");