获取本月第几周的方法：

var getMonthWeek = function (a, b, c) {

        /**

        * a = d = 当前日期

        * b = 6 - w = 当前周的还有几天过完(不算今天)

        * a + b 的和在除以7 就是当天是当前月份的第几周

        */

        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("2022", "12", "28");

    console.log("今天是 " + getDate.getYear + " 年的第 "+ getDate.getMonth + " 月的第 " + getDate.getWeek + " 周");

获取年的第几周的方法：

var getYearWeek = function(a, b, c){

    /*

    date1是当前日期

    date2是当年第一天

    d是当前日期是今年第多少天

    用d + 当前年的第一天的周差距的和在除以7就是本年第几周

    */

        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);

};

 var getYear=getYearWeek("2022", "12", "28");

    console.log(getYear);