JS将日期转换成当年的周数（work week）

getYearWeek.js

// 时间格式 yyyy-MM-dd
function getYearWeek(date) {
    var date = new Date(date);
    var date2 = new Date(date.getFullYear(), 0, 1);
    var day1 = date.getDay();
    if (day1 == 0) day1 = 7;
    var day2 = date2.getDay();
    if (day2 == 0) day2 = 7;
    d = Math.round((date.getTime() - date2.getTime() + (day2 - day1) * (24 * 60 * 60 * 1000)) / 86400000);
    return Math.ceil(d / 7) + 1;
}

console.log(getYearWeek("2020-09-07")); //37