使用html2canvas插件，将带文本标签的图片，或内嵌二维码一起生成图片并支持下载

第一步，下载插件

npm install html2canvas -S

第二步，复制粘贴即可使用

 <div ref="courseInfo">
     <span class="shopNameClass">{{this.shopInformation.shopName}}</span>
     <div id="canbox">
       <canvas id="canvas1"></canvas>  //  二维码
       <img :src="codeIMG" alt />
      <el-button type="primary" class="button8" @click="saveImg">保存图片</el-button>
     </div>
 </div>

import html2canvas from 'html2canvas';
// 写在事件里
saveImg() {
     html2canvas(this.$refs.courseInfo).then(canvas => {
        // this.$refs.addImage.append(canvas);//在下面添加canvas节点
        let link = document.createElement("a");
        link.href = canvas.toDataURL(’image/png‘);//下载链接
        link.setAttribute("download","qrcode.png");
        link.style.display = "none";//a标签隐藏
        document.body.appendChild(link);
        link.click();
      }); 
}