校验数组是否为空

校验数组是否为空

const isNotEmpty = arr => Array.isArray(arr) && !!arr.length;   isNotEmpty([1, 2, 3]); // Result: true

回到顶部

function topFunction() {  document.body.scrollTop = 0;   document.documentElement.scrollTop = 0;   }

求数字的平均值

const average = (...args) => args.reduce((a, b) => a + b) / args.length;      average(1, 2, 3, 4); // Result: 2.5

校验数字是奇数还是偶数

const isEven = num => num % 2 === 0;      console.log(isEven(2));  // Result: True

数组去重

const removeDuplicates = (arr) => [...new Set(arr)];      console.log(removeDuplicates([1, 2, 3, 3, 4, 4, 5, 5, 6])); // Result: [ 1, 2, 3, 4, 5, 6 ]