div(style="color: #0040ff;cursor:pointer;" @click="downloadFun(val)") 下载

参考来源
https://www.cnblogs.com/liulinjie/p/10245483.html

//js
// 下载
    downloadFun(val) {
      let url = this.server.fileUrl + val.url
      let type = val.name.indexOf("jpg") !== -1 || val.name.indexOf("gif") !== -1 || val.name.indexOf("jpeg") !== -1 || val.name.indexOf("bmp") !== -1 || val.name.indexOf("png") !== -1 || val.name.indexOf("tiff") !== -1 || val.name.indexOf("raw") !== -1 ? 'img' : 'other'
      if(type == 'img') {
        this.downloadIamge(url,val.name)
      }else {
        window.open(url)
      }
    },
    downloadIamge(imgsrc, name ) {//下载图片地址和图片名
      debugger
      let image = new Image();
      // 解决跨域 Canvas 污染问题
      image.setAttribute("crossOrigin", "anonymous");
      image.onload = function() {
        let canvas = document.createElement("canvas");
        canvas.width = image.width;
        canvas.height = image.height;
        let context = canvas.getContext("2d");
        context.drawImage(image, 0, 0, image.width, image.height);
        let url = canvas.toDataURL("image/png"); //得到图片的base64编码数据
        let a = document.createElement("a"); // 生成一个a元素
        let event = new MouseEvent("click"); // 创建一个单击事件
        a.download = name || "photo"; // 设置图片名称
        a.href = url; // 将生成的URL设置为a.href属性
        a.dispatchEvent(event); // 触发a的单击事件
      };
      image.src = imgsrc;
    },