js 获取当天属于当年中第几周

 

 

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function getWeek(dt) {        let d1 = new Date(dt);        let d2 = new Date(dt);        d2.setMonth(0);        d2.setDate(1);        let rq = d1 - d2;        let days = Math.ceil(rq / (24 * 60 * 60 * 1000));        let num = Math.ceil(days / 7);        return num+1;    }    var ss = getWeek("2023-10-07")    alert(ss);