JS 代码简约方法

// 检测数组
 const isNotEmpty = arr =>{ Array.isArray(arr) && arr.length > 0};
 isNotEmpty([1, 2, 3]);

//回到顶部
 const goToTop = () => window.scrollTo(0, 0);
 goToTop();

// 就平均值
  const average = (...args) => args.reduce((a, b) => a + b) / args.length;
  average(1, 2, 3, 4);

 // 奇偶判断
  const isEven = num => num % 2 === 0;
  console.log(isEven(2));

  // 获取时间是分秒
  const timeFromDate = date => date.toTimeString().slice(0, 8);
  console.log(timeFromDate(new Date(2021, 0, 10, 17, 30, 0)));

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

 // 计算两天之间相差的天数
  const dayDif = (date1, date2) => Math.ceil(Math.abs(date1.getTime() - date2.getTime()) / 86400000)
  dayDif(new Date("2020-10-21"), new Date("2021-10-22"))

// 计算当前天数
const dayOfYear= (date) => Math.floor((date - new Date(date.getFullYear(), 0, 0)) / 1000 / 60 / 60 / 24);
dayOfYear(new Date());

// 复制的剪切板
const copyToClipboard = (text) => navigator.clipboard.writeText(text);
copyToClipboard("Hello World");