Example analysis of 60s countdown for obtaining verification code in WeChat mini program

This article mainly introduces in detail the WeChat applet to implement a 60s countdown to obtain the verification code. It has a certain reference value. Interested friends can refer to it.

The example in this article is shared with everyone on WeChat. The specific code of the mini program countdown to obtain the verification code is for your reference. The specific content is as follows

1. Tool class (refer to the tool class provided by the WeChat mini program)

countdown.js

class Countdown {
constructor(options = {}) {
Object.assign(this, {
options, 
})
this.__init()
}
/**
* 初始化
*/
__init() {
this.page = getCurrentPages()[getCurrentPages().length - 1]
this.setData = this.page.setData.bind(this.page)
this.restart(this.options)
}
/**
* 默认参数
*/
setDefaults() {
return {
date: `June 7, 2087 15:03:25`, 
refresh: 1000, 
offset: 0, 
onEnd() {}, 
render(date) {}, 
}
}
/**
* 合并参数
*/
mergeOptions(options) {
const defaultOptions = this.setDefaults()
for (let i in defaultOptions) {
if (defaultOptions.hasOwnProperty(i)) {
this.options[i] = typeof options[i] !== `undefined` ? options[i] : defaultOptions[i]
if (i === `date` && typeof this.options.date !== `object`) {
this.options.date = new Date(this.options.date)
}
if (typeof this.options[i] === `function`) {
this.options[i] = this.options[i].bind(this)
}
}
}
if (typeof this.options.date !== `object`) {
this.options.date = new Date(this.options.date)
}
}
/**
* 计算日期差
*/
getDiffDate() {
let diff = (this.options.date.getTime() - Date.now() + this.options.offset) / 1000
let dateData = {
years: 0,
days: 0,
hours: 0,
min: 0,
sec: 0,
millisec: 0,
}
if (diff <= 0) {
if (this.interval) {
this.stop()
this.options.onEnd()
}
return dateData
}
if (diff >= (365.25 * 86400)) {
dateData.years = Math.floor(diff / (365.25 * 86400))
diff -= dateData.years * 365.25 * 86400
}
if (diff >= 86400) {
dateData.days = Math.floor(diff / 86400)
diff -= dateData.days * 86400
}
if (diff >= 3600) {
dateData.hours = Math.floor(diff / 3600)
diff -= dateData.hours * 3600
}
if (diff >= 60) {
dateData.min = Math.floor(diff / 60)
diff -= dateData.min * 60
}
dateData.sec = Math.round(diff)
dateData.millisec = diff % 1 * 1000
return dateData
}
/**
* 补零
*/
leadingZeros(num, length = 2) {
num = String(num)
if (num.length > length) return num
return (Array(length + 1).join(`0`) + num).substr(-length)
}
/**
* 更新组件
*/
update(newDate) {
this.options.date = typeof newDate !== `object` ? new Date(newDate) : newDate
this.render()
return this
}
/**
* 停止倒计时
*/
stop() {
if (this.interval) {
clearInterval(this.interval)
this.interval = !1
}
return this
}
/**
* 渲染组件
*/
render() {
this.options.render(this.getDiffDate())
return this
}
/**
* 启动倒计时
*/
start() {
if (this.interval) return !1
this.render()
if (this.options.refresh) {
this.interval = setInterval(() => {
this.render()
}, this.options.refresh)
}
return this
}
/**
* 更新offset
*/
updateOffset(offset) {
this.options.offset = offset
return this
}
/**
* 重启倒计时
*/
restart(options = {}) {
this.mergeOptions(options)
this.interval = !1
this.start()
return this
}
}

export default Countdown

2. WXML part:

<view class="weui-cell__ft">
 <view class="weui-vcode-btn" bindtap="vcode">{{ c2 || &#39;获取验证码&#39; }}</view>
</view>

3. JS part:

import $wuxCountDown from 'countdown/countdown'
export {
 $wuxCountDown, 
}
import { $wuxCountDown } from '../../components/wux'
 vcode: function () {
 if (this.c2 && this.c2.interval) return !1
 this.c2 = new $wuxCountDown({
 date: +(new Date) + 60000,
 onEnd() {
 this.setData({
  c2: '重新获取验证码',
 })
 },
 render(date) {
 const sec = this.leadingZeros(date.sec, 2) + ' 秒后重发 '
 date.sec !== 0 && this.setData({
  c2: sec,
 })
 },
 })
 }

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