微信小程序：js工具函数

存档，备用

// 节流：在一定时间内连续触发某事件，在这段时间段内只执行首次触发的那一次。
function throttleFunc(func, timeGap) {    
  if (timeGap==null || typeof(timeGap)=="undefined") {
    timeGap = 2000 // 如果没有传递参数timeGap，或者该参数值为空，则使用默认值2000毫秒
  }
  let lastTime = null
  return function () {
    let currentTime = + new Date()
    if (currentTime - lastTime > timeGap || !lastTime) {
      console.log('exec', currentTime) // 正式环境可去掉
      func.apply(this, arguments)
      lastTime = currentTime
    }else {
      console.log('no exec') // 正式环境可去掉
    }
  }
}

// 格式化日期，示例：2021/12/01 12:12:01
const formatTime = date => {
  const year = date.getFullYear()
  const month = date.getMonth() + 1
  const day = date.getDate()
  const hour = date.getHours()
  const minute = date.getMinutes()
  const second = date.getSeconds()

  return `${[year, month, day].map(formatNumber).join('/')} ${[hour, minute, second].map(formatNumber).join(':')}`
}

// 格式化日期，示例：20211201121201
const formatTime2 = date => {
  const year = date.getFullYear()
  const month = date.getMonth() + 1
  const day = date.getDate()
  const hour = date.getHours()
  const minute = date.getMinutes()
  const second = date.getSeconds()

  return `${[year, month, day].map(formatNumber).join('')}${[hour, minute, second].map(formatNumber).join('')}`
}

// 格式化日期，示例：2021/12/01
const formatTime3 = date => {
  const year = date.getFullYear()
  const month = date.getMonth() + 1
  const day = date.getDate()

  return `${[year, month, day].map(formatNumber).join('-')}`
}

// 数字不足两位时，前面补0
const formatNumber = n => {
  n = n.toString()
  return n[1] ? n : `0${n}`
}

// 数字不足三位时，后面补0
const formatNumber2 = n => {
  n = n.toString()
  return n[2] ? n :  n[1] ? `${n}0` : `${n}00`
}

// 格式化时间，格式化示例：05:00
const formatShowTime = number => {
  let minute = Math.floor(number/60)
  let second = Math.floor(number%60)

  return `${[minute, second].map(formatNumber).join(':')}`
}

// 格式化时间，格式化示例：05:00.000
const formatShowMillisecond = number => {
  let minute = Math.floor(Math.floor(number/1000)/60)
  let second = Math.floor(Math.floor(number/1000)%60)
  let millisecond = Math.floor(number%1000)

  return `${[minute, second].map(formatNumber).join(':')}` + '.'+formatNumber2(millisecond)
}

module.exports = {
  throttleFunc,
  formatTime,
  formatTime2,
  formatTime3,
  formatShowTime,
  formatShowMillisecond,
}