获取本年度第几周、本月第几周

// 获取本年度第几周
var getYearWeek = function(a, b, c)
{
        var date1 = new Date(a, parseInt(b) - 1, c),
              date2 = new Date(a, 0, 1),
              d = Math.round((date1.valueOf() - date2.valueOf()) / 86400000);
        return Math.ceil((d + ((date2.getDay() + 1) - 1)) / 7);
};

getYearWeek(2019,08,15)

// 获取本月第几周
var getMonthWeek = function (a, b, c) {
        var date = new Date(a, parseInt(b) - 1, c),
            w = date.getDay(),
            d = date.getDate();
        if(w==0){
            w=7;
        }
        var config={
            getMonth:date.getMonth()+1,
            getYear:date.getFullYear(),
            getWeek:Math.ceil((d + 6 - w) / 7),
        }
        return config;
    };
    var getDate=getMonthWeek(2019,08,15);
    console.log("今天是 " + getDate.getYear + " 年的第 "+ getDate.getMonth + " 月的第 " + getDate.getWeek + " 周");

原文地址：https://www.cnblogs.com/kewenxin/p/11357622.html