JS 今天星期幾

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const dayNumber = new Date().getDay()
let day = '星期日'
switch(dayNumber){
  case 1:
    day = '星期一'
    break
  case 2:
    day = '星期二'
    break
  case 3:
    day = '星期三'
    break
  case 4:
    day = '星期四'
    break
  case 5:
    day = '星期五'
    break
  case 6:
    day = '星期六'
    break
}
console.log('今天' + day)

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const dayNumber = new Date().getDay()
const days = {
  0: '星期日',
  1: '星期一',
  2: '星期二',
  3: '星期三',
  4: '星期四',
  5: '星期五',
  6: '星期六'
}
const day = days[dayNumber]
console.log('今天' + day)