base64位转化为图片url

***base64位地址其实也可以直接放在img的src回显
1.在created生命周期调用查看接口，得到base64位后，先得到file对象

 created() {
    console.log(this.rowData);
    apivideoSearchimg({ id: this.rowData.id }).then((res) => {
      console.log("回显idD", res);
      const img = "data:image/png;base64," + res.data[0].imgBase64;
      console.log("img", img);
      this.file = this.base64ImgtoFile(img); // 得到File对象
      console.log("thisfile", this.file);
      console.log(
        "图片地址",
        window.webkitURL.createObjectURL(this.file) ||
          window.URL.createObjectURL(this.file)
      );
      this.imgUrl =
        window.webkitURL.createObjectURL(this.file) ||
        window.URL.createObjectURL(this.file);
      this.imgList.push(this.imgUrl);
    });
  },

2.得到url

  base64ImgtoFile(dataurl, filename = "file") {
      const arr = dataurl.split(",");
      const mime = arr[0].match(/:(.*?);/)[1];
      const suffix = mime.split("/")[1];
      const bstr = atob(arr[1]);
      let n = bstr.length;
      const u8arr = new Uint8Array(n);
      while (n--) {
        u8arr[n] = bstr.charCodeAt(n);
      }
      return new File([u8arr], `${filename}.${suffix}`, {
        type: mime,
      });
    },