base64图片下载

download() {
this.resultDialog.picture.map((res, i) => {
this.downloadFile(证据 ${i + 1}.png, res) // 此处 res 为 base64 数据图片 (data:image/jpg;base64,/…)
})
},
downloadFile(fileName, content) {
let aLink = document.createElement(‘a’);
let blob = this.base64ToBlob(content); //new Blob([content]);

  let evt = document.createEvent("HTMLEvents");
  evt.initEvent("click", true, true);//initEvent 不加后两个参数在FF下会报错  事件类型，是否冒泡，是否阻止浏览器的默认行为
  aLink.download = fileName;
  aLink.href = URL.createObjectURL(blob);

  // aLink.dispatchEvent(evt);
  aLink.click()
},
base64ToBlob(code) {
  let parts = code.split(';base64,');
  let contentType = parts[0].split(':')[1];
  let raw = window.atob(parts[1]);
  let rawLength = raw.length;

  let uInt8Array = new Uint8Array(rawLength);

  for (let i = 0; i < rawLength; ++i) {
    uInt8Array[i] = raw.charCodeAt(i);
  }
  return new Blob([uInt8Array], { type: contentType });
},

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版权声明：本文为CSDN博主「肖ZE」的原创文章，遵循CC 4.0 BY-SA版权协议，转载请附上原文出处链接及本声明。
原文链接：https://blog.csdn.net/lucky541788/article/details/104458233