n602655099的专栏

1.输出今天是今年的第多少天，也可查询到年底还有多少天function getDays(cur, prv) { return (Math.abs((new Date(cur)).getTime() - (new Date(prv)).getTime()) / (60*60*24*1000)).toFixed() // 日期时间戳相减获取差值，除于一天的时间戳，获取正整数}alert(getDays('2021-05-14', '2021-01-01'))alert(getDays('2

1.对象合并var a = {name: 'Adele', age: 20}var b = {name: 'Chris', age: 20, address: 'beijing'}function update (...args) { return Object.assign(...args)}console.log(update(a, b))2.阶乘f...