进度条函数

/**
 * 创建浏览器控制台进度条
 * @param {number} total - 任务总个数
 * @returns {{step: ((function(): ({finished: boolean}))|*)}}
 */
function createProcessBar(total) {
  let curr = 0
  let finished = false

  return {
    step: () => {
      if (finished) return { finished }
      curr++
      const percentage = Number((curr / total * 100).toFixed(2))
      const percentageStr = percentage > 100 ? '100.00%' : `${percentage.toFixed(2)}%`

      const currOnBar = Math.ceil(curr * 100 / total)
      const bar = `${''.padEnd(currOnBar, '|')} ${percentageStr} ${''.padEnd(100 - currOnBar, '.')}`
      console.clear()
      console.log(bar)
      if (currOnBar >= 100) {
        finished = true
      }
      return { finished }
    }
  }
}

使用示例

// usage example

const bar = createProcessBar(100)

const timer = setInterval(() => {
  const { finished } = bar.step()
  if (finished) {
    clearInterval(timer)
  }
}, 1000)

输出