js,react根据日期判断周几

const Date2Week = (value) => {
  const day = new Date(Date.parse(value.replace(/-/g, '/'))); //将日期值格式化
  const today = ["周日", "周一", "周二", "周三", "周四", "周五", "周六"];
  return today[day.getDay()];//day.getDay();根据Date返一个星期中的某一天，其中0为星期日
};
或者
js

function Date2Week(value){

const day = new Date(Date.parse(value.replace(/-/g, '/')));
const today = ["周日", "周一", "周二", "周三", "周四", "周五", "周六"];
return today[day.getDay()]
}

 

Date2Week('2019-09-23') // "周一"