js获取当前日期是第几周、每年有多少周、周的开始时间和结束时间

这里以moment.js作编写。
视图：

代码：

//引入moment.js
import moment from 'moment';
//获取一年中有多少周、每一周开始和结束时间
const mapWeeksOfyear = ({ year} = {}) => {
    const nowYear = year ? year : moment().year();
    const timestamp = (new Date()).valueOf()
        // 设置正在处理的年份
    let handleYear = moment(new Date(String(nowYear)));
      // 这一年有多少个周
    const totalWeeks = handleYear.endOf('year').isoWeek();
    const arryWeek  = [];
    let currentWeek = null; //当前日期是第几周
    for(let i = 1;i <= totalWeeks;i++){
        let startOf = handleYear.week(i).startOf('week').format('MM-DD');
        let endOf = handleYear.week(i).endOf('week').format('MM-DD');
        let ednyear = handleYear.week(i).endOf('week').format('YYYY');
        let  startValue= handleYear.week(i).startOf('week').valueOf();
        let  endValue= handleYear.week(i).endOf('week').valueOf();
        if(startValue<=timestamp&&endValue>=timestamp){
            currentWeek = i
        }
        arryWeek.push({
            value: i,
            name: `第${i}周 ${ednyear>nowYear?nowYear + "-" +startOf :startOf} 至 ${ednyear>nowYear?ednyear + "-" +endOf:endOf}`,
            startTime: handleYear.week(i).startOf('week').format('YYYY-MM-DD'),// 这周的开始时间
            endTime: handleYear.week(i).endOf('week').format('YYYY-MM-DD'), // 这周的结束时间
        })
    } 
    return {arryWeek,currentWeek}
}

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