后台项目二维码导出并下载功能

vue导出二维码并下载功能

qrcodejs2：qrcodejs2

UI:element

html2canvas:html2canvas

效果图

安装

npm install qrcodejs2  --save
npm install html2canvas --save 

引入

import QRCode from 'qrcodejs2'
import html2canvas from 'html2canvas'

HTML

<el-dialog title="查看分享链接" :visible.sync="getlinkVisible" width="400px" @close="closeCode">
      <div style="text-align: center;  100%">
        <div id="qrcode" ref="qrcode" class="qrcode"></div>
      </div>

      <span slot="footer" class="dialog-footer">
        <el-button type="primary" @click="saveQrCode">下载</el-button>
        <el-button @click="getlinkVisible = false">取 消</el-button>
      </span>
    </el-dialog>

CSS

我使用的是less

用于设置二维码的边框

.qrcode {
  display: inline-block;
  padding: 6px;
  border: 2px solid black;
  img {
     132px;
    height: 132px;
    background-color: #fff; //设置白色背景色
    padding: 6px; // 利用padding的特性，挤出白边
    box-sizing: border-box;
  }
}

JS

生成二维码

qrcode(h5Link) {
      this.qr = new QRCode('qrcode', {
        text: window.location.protocol+window.location.host+'/GradePhone?h5Link='+h5Link,
         128,
        height: 128,
        colorDark: '#000000',
        colorLight: '#ffffff',
        correctLevel: QRCode.CorrectLevel.H,
      })
      console.log(this);
    },

导出图片

saveQrCode() {
      html2canvas(this.$refs.qrcode).then(function (canvas) {
        let link = document.createElement('a')
        link.href = canvas.toDataURL() //下载链接
        link.setAttribute('download', '二维码.png')
        link.style.display = 'none' //a标签隐藏
        document.body.appendChild(link)
        link.click()
      })
    },