使用moment.js的两三方法，比较日期大小，获取今日昨日本周本月本年等等等

let date1 = moment('2023-04-01');
let date2 = moment('2023-04-02');

if (date1.isBefore(date2)) {
    console.log('date1 is before date2');
} else if (date1.isAfter(date2)) {
    console.log('date1 is after date2');
} else {
    console.log('date1 is the same as date2');
}

let today = moment();
console.log(today.format()); // 默认格式输出

let yesterday = moment().subtract(1, 'days');
console.log(yesterday.format());

let startOfWeek = moment().startOf('week');
console.log(startOfWeek.format());

let startOfMonth = moment().startOf('month');
console.log(startOfMonth.format());

let startOfYear = moment().startOf('year');
console.log(startOfYear.format());