// 复制文字
  copyText(link, cb) {
    let input = document.createElement('textarea');
    input.style.CSSText = 'position: absolute; top: 0; left: 0; opacity: 0; z-index: -10;';
    input.value = link;
    document.body.appendChild(input);
    input.select();
    document.execCommand('copy');
    document.body.removeChild(input);
    if (typeof cb === 'function') {
      cb();
    }
  }

copyTextToClipboard(text) {
  return new Promise((resolve, reject) => {
    navigator.clipboard.writeText(text).then(
      () => {
        resolve(true)
      },
      () => {
        reject(new Error('复制失败'))
      }
    )
  })
}

  // 图片元素转base64
  getBase64Image(img) {
    let canvas = document.createElement('canvas');
    canvas.width = img.width;
    canvas.height = img.height;
    let ctx = canvas.getContext('2d');
    ctx?.drawImage(img, 0, 0, img.width, img.height);
    let dataURL = canvas.toDataURL('image/png');
    return dataURL;
  },
  // base64图片转为blob
  getBlobImage(dataurl) {
    let arr = dataurl.split(',');
    let mime = arr[0].match(/:(.*?);/)[1];
    let bstr = atob(arr[1]);
    let n = bstr.length;
    let u8arr = new Uint8Array(n);
    while (n--) {
      u8arr[n] = bstr.charCodeAt(n);
    }
    return new Blob([u8arr], { type: mime });
  },
  // 复制图片
  copyImage(dom, cb) {
    let dataurl = this.getBase64Image(dom);
    let blob = this.getBlobImage(dataurl);
    navigator.clipboard.write([
      new window.ClipboardItem({
        [blob.type]: blob
      })
    ]).then(function() {
      if (typeof cb === 'function') {
        cb();
      }
    }, function() {
      console.log('图片复制失败！');
    });
  }