由于步骤太多，字数太多，废话也太多，所以前后端分开讲了，后端文章请看：

超详细 anji-captcha滑块验证springboot+uniapp微信小程序前后端组合https://blog.csdn.net/new_public/article/details/149116742

anji-captcha开源项目地址：https://github.com/anji-plus/captcha

anji-captcha开源文档地址：在线体验暂时下线！！！ | AJ-Captcha

写完后端代码，开始写前端，首选肯定又是一顿各种网上查资料搬砖，发现基本清一色用了anji-captcha开源文档介绍的【Verify】组件，这组件是anji-captcha开源项目里面有的，在view文件夹下面，选择自己对应的前端类型，里面有下面几种类型。

比如：/view/vue/src/components/verifition/Verify

不过我没去看，是自己写了一个，毕竟只有自己写的才是最适合自己的。

效果如下：

每次滑动有广告语出现，比如视频里的，【大怨种】【纯牛马】。

获取次数和验证次数超限，会显示提示等。

组件代码

<template><modal ref="$captchaModal" :width="modalWidth" :padding="modalPadding"><template #body><view class="captcha-modal-content" :style="{ height: 'calc(' + slideImageHeight + 'px + ' + slideBlockWidth + 'px + 12rpx)' }"><template v-if="sliderCaptchaBackBase64"><image class="captcha-back-image":style="{ width: slideImageWidth + 'px', height: slideImageHeight + 'px' }":src="sliderCaptchaBackBase64" /><image class="captcha-slider-image" :src="sliderCaptchaBlockBase64":style="{ width: slideBlockWidth + 'px', height: slideImageHeight + 'px', transform: 'translate3d(' + lastLeft + 'px,0,0)' }" /></template><image v-else src="/static/images/svg/null_data.svg" class="captcha-back-image" style="height: 300rpx;"/><view class="slide-parent" :style="{ width: slideImageWidth + 'px', height: slideBlockWidth + 'px',backgroundColor: sliderCaptchaBackBase64 ? 'rgb(233, 233, 233)' : 'transparent' }"><template  v-if="sliderCaptchaBackBase64"><view class="slide-tip tui-text-flashover">拖动滑块验证</view><view class="slide-cover" :style="{ width: lastLeft + 'px' }"><view class="slide-cover-content" :style="{ width: slideImageWidth + 'px' }">{{ slideCoverText }}</view></view><view class="slide-view" :style="{ width: slideBlockWidth + 'px', height: slideBlockWidth + 'px', transform: 'translate3d(' + lastLeft + 'px,0,0)' }"@touchstart="touchstart" @touchmove="touchmove" @touchend="touchend"><tui-icon name="up" :size="19" style="transform: rotate(90deg);" /></view></template><view v-else class="tui-flex-center" style="height: 100%;":class="{ 'tui-underline': captChaGetRepCode !== '6201' }"@click="delayedGenerateSlideCaptchaImage">{{ errorMsg }}</view></view></view></template></modal>
</template>
<script>// 这里用到util是防抖动方法和四舍五入方法，自己写一个吧，或者问api给一个import util from '@/utils/util'// npm i crypto-js -s 引入，这里用的是4.2.0版本import CryptoJS from 'crypto-js/crypto-js'export default {data () {return {// 滑块宽高度 pxslideBlockWidth: 47,// 背景图宽度 pxslideImageWidth: 310,// 背景图高度 pxslideImageHeight: 155,// 弹窗占据屏幕 90%modalWidth: 90,// 弹窗内部左右边距20pxmodalLRpadding: 20,// 缩放比率，不同屏幕的手机，必须适配scaleRatio: 0,// 滑动起始X位置 pxstartX: 0,// 滑动停止位置，也就是距离起始位置长度 pxlastLeft: 0,// 后端返回的验证码参数captchaOption: {},// 父页面参数parentOption: {},// 获取滑块验证码返回的结果码，用来显示错误信息的captChaGetRepCode: void (0),// 广告语，每次随机取slideCoverTextList: ['大怨种', '纯牛马', '肝吧', '挤上牛马传送带', '这就是命啊']}},created () {// 初始化背景图和滑块缩放this.handlerCaptchaScale()// 手动获取滑块验证码的方法，加上防抖动，350毫秒this.delayedGenerateSlideCaptchaImage = util.debounce(this.delayedGenerateSlideCaptchaImage, 350)},computed: {modalPadding () {return `40rpx ${this.modalLRpadding}px 20rpx ${this.modalLRpadding}px`},// 广告语，随机取，为了能随机，故跟startX绑定上了slideCoverText () {const initIndex = Math.floor(Math.random() * this.slideCoverTextList.length)const startXStr = String(this.startX)const finalIndex = initIndex + (startXStr.length > 1 ? Number(startXStr.substring(startXStr.length - 1)) : this.startX)return this.slideCoverTextList[finalIndex > this.slideCoverTextList.length - 1 ? initIndex : finalIndex]},// 背景图base64sliderCaptchaBackBase64 () {const { originalImageBase64 } = this.captchaOptionif (!originalImageBase64) {return ''}return 'data:image/png;base64,' + originalImageBase64},// 滑块base64sliderCaptchaBlockBase64 () {const { jigsawImageBase64 } = this.captchaOptionif (!jigsawImageBase64) {return ''}return 'data:image/png;base64,' + jigsawImageBase64},errorMsg () {if (this.captChaGetRepCode === '6201') {return '获取图形验证码频繁，请稍后再试'} else if (this.captChaGetRepCode !== '0000') {return '啊哦，加载失败了，点击这里刷新'}return ''}},methods: {// 显示滑块验证码弹窗，父页面通过ref通用show (option = {}) {this.resetSlideCaptcha()this.parentOption = optionthis.generateSlideCaptchaImage().then(_ => {this.$nextTick(() => {// 调用弹窗组件方法，显示弹窗this.$refs.$captchaModal.show({title: option.title || '验证',maxHeight: 800,hideCancel: true,confirmText: '关闭',// 弹窗关闭按钮点击回调callback: _ => {// 如果父页面有关闭回调，则这里调用this.parentOption.closeCallback && this.parentOption.closeCallback()}})})})},close () {this.resetSlideCaptcha()// 关闭弹窗this.$refs.$captchaModal.onClose()},// 初始化缩放比率，以及设置滑块背景和滑块宽高handlerCaptchaScale () {const { windowWidth } = uni.getSystemInfoSync()const modalWidthPx = windowWidth * (this.modalWidth / 100)const modalLRpaddingSum = this.modalLRpadding * 2const modalInternalWidth = modalWidthPx - modalLRpaddingSumconst onePercentagePx = windowWidth * 0.01if (modalInternalWidth > this.slideImageWidth) {// 如果屏幕宽度大于初始化滑块背景图宽度，则不缩放this.modalWidth = util.toFixed((this.slideImageWidth + modalLRpaddingSum) / onePercentagePx, 2)} else if (modalInternalWidth < this.slideImageWidth) {// 否则缩放滑块背景图和滑块this.scaleRatio = modalInternalWidth / this.slideImageWidththis.slideImageWidth = modalInternalWidththis.slideImageHeight = this.slideImageHeight * this.scaleRatiothis.slideBlockWidth = this.slideBlockWidth * this.scaleRatio}},// 手动重新获取delayedGenerateSlideCaptchaImage () {if (this.captChaGetRepCode === '6201') {return}this.generateSlideCaptchaImage()},// 获取滑块验证码generateSlideCaptchaImage () {return new Promise((resolve, reject) => {// request 基于uni.request封装，总之就是调获取验证码接口request('/captcha/get', 'POST', { 'captchaType' : 'blockPuzzle' }, true).then(({ repData = {}, repCode }) => {this.captChaGetRepCode = repCodethis.captchaOption = repData}).finally(() => {resolve()})})},// 按中滑块，记录起始位置touchstart (e) {const touch = e.touches[0] || e.changedTouches[0]this.startX = touch.clientX},// 开始滑动，计算当前滑动位置touchmove (e) {const touch = e.touches[0] || e.changedTouches[0]const pageX = touch.clientXconst width = this.slideImageWidth - this.slideBlockWidth - 1let left = pageX - this.startXleft = left < 0 ? 0 : (left >= width ? width : left)this.lastLeft = left},// 滑动结束（松手），验证touchend () {/*** callback 父页面验证结果回调* verifyCaptchaCallback 整个验证由父页面处理* verifyApi 验证后端接口* * callback 和 verifyCaptchaCallback 二选一* 选callback，verifyApi必传，让这个这个组件调用验证接口*/const { callback, verifyCaptchaCallback, verifyApi } = this.parentOptionif (callback || verifyCaptchaCallback) {if (verifyCaptchaCallback) {verifyCaptchaCallback(this.captchaOption).then(flag => {if (flag) {this.close()} else {this.resetSlideCaptcha(true)}})} else {this.verifyCaptcha(verifyApi).then(res => {if (res) {// 验证成功，记录本次验证码的aes密匙，给后面后端二次验证使用res.secretKey = this.captchaOption.secretKeythis.close()} else {// 验证失败重新获取this.resetSlideCaptcha(true)}callback(res)})}} else {this.resetSlideCaptcha(true)}},// 重置resetSlideCaptcha (generateFlag) {this.lastLeft = 0this.startX = 0generateFlag && this.generateSlideCaptchaImage()},// 验证滑动是否正确verifyCaptcha (verifyApi) {return new Promise((resolve, reject) => {const originalPointJson = this.generatePointJson()const param = {captchaType: 'blockPuzzle',token: this.captchaOption.token,pointJson: this.pointEncrypted(originalPointJson)}// request 基于uni.request封装，总之就是调验证接口request(verifyApi || '/captcha/check', 'POST', param, true).then(res => {const { repCode, repData = {}, repMsg } = resif (repCode === '0000' && repData.result) {resolve({ ...repData, originalPointJson })} else {// toast 等同 uni.showToast()toast(repMsg || '验证失败')resolve(false)}}).catch(_ => {resolve(false)})})},// 生成当前滑动完成的坐标点，加密的原文generatePointJson () {const x = this.scaleRatio > 0 ? ((this.lastLeft - 1) / this.scaleRatio) : this.lastLeft - 1return JSON.stringify({x,y:0})},// aes加密坐标点pointEncrypted (originalPointJson) {const key = CryptoJS.enc.Utf8.parse(this.captchaOption.secretKey)const encrypted = CryptoJS.AES.encrypt(CryptoJS.enc.Utf8.parse(originalPointJson),key,{mode: CryptoJS.mode.ECB,padding: CryptoJS.pad.Pkcs7})return encrypted.toString()},// 生成后端二次验证的密文captchaVerificationEncrypted ({ originalPointJson, token, secretKey }) {const key = CryptoJS.enc.Utf8.parse(secretKey)const dataToEncrypt = token + '---' + originalPointJsonconst encrypted = CryptoJS.AES.encrypt(CryptoJS.enc.Utf8.parse(dataToEncrypt),key,{mode: CryptoJS.mode.ECB,padding: CryptoJS.pad.Pkcs7})return encrypted.toString()}}}
</script>
<style scoped lang="scss">.captcha-modal-content {position: relative;.captcha-back-image {width: 100%;border-radius: 10rpx;}.captcha-slider-image {position: absolute;left: 0;top: 0;z-index: 1;}.slide-parent {width: 100%;background-color: rgb(233, 233, 233);position: relative;padding: 1px 0;.slide-tip {position: absolute;top: 0;left: 0;right: 0;bottom: 0;color: #616161;font-size: 30rpx;display: flex;align-items: center;justify-content: center;}.slide-cover {width: 0;height: 100%;position: absolute;left: 0;top: 0;z-index: 1;display: flex;align-items: center;justify-content: center;overflow: hidden;.slide-cover-content {height: 100%;color: #FFF;background-color: #0081ff;font-size: 30rpx;display: flex;align-items: center;justify-content: center;position: absolute;left: 0;top: 0;}}.slide-view {position: absolute;left: 1px;z-index: 2;background: #FFF;display: flex;align-items: center;justify-content: center;}}}.tui-text-flashover {background: -webkit-gradient(linear, left top, right top, color-stop(0, #444), color-stop(.4, #444), color-stop(.5, white), color-stop(.6, #444), color-stop(1, #444));-webkit-background-clip: text !important;-webkit-text-fill-color: transparent !important;-webkit-animation: animate 1.8s infinite;}.tui-flex-center {display: flex;align-items: center;justify-content: center;}.tui-underline {text-decoration: underline;}@-webkit-keyframes animate {from {background-position: -90rpx;}to {background-position: 90rpx;}}@keyframes animate {from {background-position: -90rpx;}to {background-position: 90rpx;}}
</style>

注意：组件代码不可直接复制使用，里面使用了一些我项目的封装代码（下面这些）。

toast方法，是输出提示。
request方法，是调后端接口。
<modal>是我封装的一个弹窗组件，弹窗组件UI库大把，自己套一个。参数width是百分比，我的modal组件接收的是Number，所以这里初始90，代表占屏幕90%宽度。然后再根据屏幕大小决定弹窗大小的。
两个import上面有注释说明。

最好看一遍代码的里面的注释，上面说的几个地方需要自己改一下。

使用流程

功能引入此组件并定义ref，通过ref调用组件的show方法即可，传入参数，例如：

this.$refs.$sliderCaptcha.show({// 验证接口verifyApi: '/xxx/yyy',callback: res => {if (res) {// 验证成功，生成后端二次验证密文（也就是二次验证的redisKey）（不是必须，看自己业务，如有需要的话）const captchaVerification = this.$refs.$sliderCaptcha.captchaVerificationEncrypted(res)}}
})

其他罗里吧嗦

1：滑块滑动到缺口后，取哪里的x值？

正确缺口的开始位置，这个开始位置x值是正确的，对应后端缓存，基本大差不差。

2：怎么取？

触摸滑块时，touchstart方法记录触摸位置，滑动触发touchmove方法，获取当前滑动x值，然后减去起始触摸位置，就是正确的x值。

代码里面那个null_data.svg

我直接把源码粘贴出来，复制到文本文件里面，然后后缀改成svg就可以用了

<?xml version="1.0" encoding="UTF-8"?>
<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" width="122px" height="104px" viewBox="0 0 122 104" version="1.1"><!-- Generator: Sketch 55 (78076) - https://sketchapp.com --><title>暂无相关搜索</title><desc>Created with Sketch.</desc><g id="Page-1" stroke="none" stroke-width="1" fill="none" fill-rule="evenodd"><g id="空白页" transform="translate(-40.000000, -508.000000)"><g id="暂无相关搜索" transform="translate(40.000000, 508.000000)"><g id="分组"><g id="背景/线" fill="#C3CBD6"><g id="-"><g id="编组" transform="translate(14.200000, 9.200000)" fill-rule="nonzero"><path d="M0.8,73.1 C0.3581722,73.1 -5.68434189e-14,72.7418278 -5.68434189e-14,72.3 C-5.68434189e-14,71.8581722 0.3581722,71.5 0.8,71.5 L70.8,71.5 C71.2418278,71.5 71.6,71.8581722 71.6,72.3 C71.6,72.7418278 71.2418278,73.1 70.8,73.1 L0.8,73.1 Z M74.8,73.1 C74.3581722,73.1 74,72.7418278 74,72.3 C74,71.8581722 74.3581722,71.5 74.8,71.5 L77.3,71.5 C77.7418278,71.5 78.1,71.8581722 78.1,72.3 C78.1,72.7418278 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