vue 图片压缩 转 base64 上传图片

因业务需求，公司项目需要用到 图片上传，压缩，转 base64，而这些都是在前台实现的。我之前也没在 vue 里写过这种逻辑和代码，在我的耐心钻研下，终于交付了代码和功能。

现在想把代码发布出来，分享给大家!!!

前端页面

一丶template

<template>
  <div class="identityID">
    <x-header :left-options="{backText: ''}" :title="this.$route.meta.title"></x-header>
    <div class="toptip">
      <span>为了保证联盟内用户安全需要对您身份进行验证，您的个人信息将完全保密。</span>
    </div>
    <flow>
      <flow-state is-done title="身份证"></flow-state>

      <flow-line :line-span="48"></flow-line>

      <flow-state title="驾驶证"></flow-state>

      <flow-line :line-span="48"></flow-line>

      <flow-state title="行驶证"></flow-state>
    </flow>
    <div class="content">
      <p class="title">拍摄身份证</p>
      <div class="imgbox">
        <img :src="IDc1" alt="">
        <img :src="IDc0" alt="">
        <span class="ltitle" v-show="IDc1T">拍摄正面</span>
        <span class="rtitle" v-show="IDc0T">拍摄反面</span>
        <input accept="image/png,image/jpeg,image/jpg" class="idimg" id="IDc1" name="IDc1" type="file"
               v-on:change="uploadIMG($event)">
        <input accept="image/png,image/jpeg,image/jpg" class="idimg" id="IDc0" name="IDc0" type="file"
               v-on:change="uploadIMG($event)">
      </div>
      <p class="tip">注意：拍摄上传身份证照片需要保证清晰度，以免造成认证不通过。</p>
    </div>
    <div class="nextstp" v-if="canNext <=1">
      下一步
    </div>
    <div @click="next" class="CanNextstp" v-if="canNext ===2">
      下一步
    </div>
    <div class="toast" v-transfer-dom>
      <loading :show="show1" :text="text1"></loading>
    </div>
  </div>
</template>

二丶vue js 部分

图片处理部分分为

1丶读取上传文件

2丶转换 base64 编码

3丶使用 canvas 压缩图片

4丶上传图片

<script>
  import { Alert, Flow, FlowLine, FlowState, Loading, TransferDomDirective as TransferDom, XHeader } from 'vux'
  import * as types from '@store/mutation-types'

  export default {
    directives: {
      TransferDom
    },
    created() {
    },
    data() {
      return {
        imgList: [],
        base64img: '',
        IDc1: '/static/IDc1.png',
        IDc0: '/static/IDc0.png',
        IDc1T: true,
        IDc0T: true,
        imgUrl: '',
        canNext: 0,
        picavalue: '',
        show1: false,
        text1: ''
      }
    },
    components: {
      Flow,
      FlowState,
      FlowLine,
      XHeader,
      Alert,
      Loading
    },
    methods: {
      uploadIMG(e) {
        this.show1 = true
        this.text1 = '正在解析图片'
        let files = e.target.files || e.dataTransfer.files
        let id = e.target.id
        if (!files.length) return
        this.picavalue = files[0]
        console.log(this.picavalue.size / 1024)
        if (this.picavalue.size / 1024 > 10240) {
          this.$vux.alert.show({
            title: '温馨提示',
            content: '图片过大，请重新上传'
          })
        } else {
          this.text1 = '正在获取图片'
          this.imgPreview(this.picavalue, id)
        }
      },
      //获取图片
      imgPreview(file, id) {
        this.text1 = '正在压缩图片'
        let self = this
        //判断支不支持FileReader
        if (!file || !window.FileReader) return false
        if (/^image/.test(file.type)) {
          //创建一个reader
          let reader = new FileReader()
          //将图片转成base64格式
          reader.readAsDataURL(file)
          //读取成功后的回调
          reader.onloadend = function() {
            let result = this.result
            let img = new Image()
            img.src = result
            console.log('********未压缩前的图片大小********')
            console.log(result.length / 1024)
            img.onload = function() {
              let data = self.compress(img, 0.3)
              self.uploadImg(data, id)
            }
          }
        }
      },
      // 压缩图片
      compress(img, size) {
        let canvas = document.createElement('canvas')
        let ctx = canvas.getContext('2d')
        let initSize = img.src.length
        let width = img.width
        let height = img.height
        canvas.width = width
        canvas.height = height
        // 铺底色
        ctx.fillStyle = '#fff'
        ctx.fillRect(0, 0, canvas.width, canvas.height)
        ctx.drawImage(img, 0, 0, width, height)
        //进行最小压缩
        let ndata = canvas.toDataURL('image/jpeg', size)
        console.log('*******压缩后的图片大小*******')
        // console.log(ndata)
        console.log(ndata.length / 1024)
        return ndata
      },
      uploadImg(base64, id) {
        this.text1 = '正在上传图片'
        let body = {
          'type': 'userAuth',
          'picBase64': base64
        }
        this.$store.dispatch(types.UPLOAD_IDIMG_INFO, body).then(res => {
          this.imgUrl = res.url
          if (id === 'IDc1') {
            this.IDc1 = this.imgUrl
            this.IDc1T = false
            this.canNext++
            this.$store.commit('saveIdCardFrontUrl', this.imgUrl)
          }
          if (id === 'IDc0') {
            this.IDc0 = this.imgUrl
            this.IDc0T = false
            this.canNext++
            this.$store.commit('saveIdCardBackUrl', this.imgUrl)
          }
          this.text1 = '图片上传完成'
          let _this = this
          setTimeout(function() {
            // console.log(1111)
            _this.hideToast()
          }, 800)
        })
      },
      hideToast() {
        this.show1 = false
      },
      next() {
        this.$router.push('/home/identityDI')
      },
    }
  }
</script>

三丶css 样式

采用 less 编写
使用了 vux 组件，含部分修改组件样式代码

<style lang="less">
  .identityID .vux-header {
    position: fixed;
    width: 100%;
    top: 0;
    z-index: 999;
  }

  .weui-wepay-flow__bd .weui-wepay-flow__li_done .weui-wepay-flow__state {
    background: #FED130;
  }

  .weui-wepay-flow__line .weui-wepay-flow__process {
    background: #FED130;
  }

  .toast .weui-toast {
    min-height: 3.6em;
    top: 35%;
  }

  .nextstp {
    width: 90%;
    height: 1.22rem;
    margin: 60px auto 40px auto;
    border-radius: 0.13rem;
    color: #fff;
    background: #a8a8a8;
    font-size: 0.44rem;
    text-align: center;
    line-height: 1.22rem;
  }

  .CanNextstp {
    width: 90%;
    height: 1.22rem;
    margin: 60px auto 40px auto;
    border-radius: 0.13rem;
    color: #fff;
    background: #FED130;
    font-size: 0.44rem;
    text-align: center;
    line-height: 1.22rem;
  }

  .content {
    width: 90%;
    margin: 0 auto;

    .tip {
      font-size: 0.42rem;
      color: #aaa;
      margin-top: 30px;
    }

    .title {
      font-size: 0.48rem;
      margin-top: 50px;
    }

    .imgbox {
      position: relative;
      margin-top: 30px;
      text-align: center;

      .idimg {
        display: block;
        width: 49%;
        height: 100%;
        opacity: 0;
        position: absolute;
        top: 0;
      }

      #IDc1 {
        left: 0;
      }

      #IDc0 {
        right: 0;
      }

      .ltitle, .rtitle {
        color: #fff;
        font-size: 0.48rem;
        position: absolute;
        bottom: 15px;
      }

      .ltitle {
        left: 45px;
      }

      .rtitle {
        right: 45px;
      }

      img {
        width: 4.3rem;
        height: 4.38rem;
        border-radius: 0.13rem;
      }
    }
  }

  .toptip {
    margin-top: 47px;
    width: 100%;
    height: 1.39rem;
    font-size: 0.39rem;
    color: #000;
    background: #FFF7D8;

    span {
      display: block;
      width: 90%;
      margin: 0 auto;
      padding-top: 3.5%;
    }
  }
</style>

文章到处结束，本人菜鸟一枚，有问题欢迎补充!
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