data:image data url 文件转为Blob上传后端的方法

// base64 转 blobdataURItoBlob(dataURI) {  // convert base64/URLEncoded data component to raw binary data held in a string  let byteString;  if (dataURI.split(',')[0].indexOf('base64') >= 0) {    byteString = atob(dataURI.split(',')[1]);  } else byteString = unescape(dataURI.split(',')[1]);  // separate out the mime component  const mimeString = dataURI    .split(',')[0]    .split(':')[1]    .split(';')[0];  // write the bytes of the string to a typed array  const ia = new Uint8Array(byteString.length);  for (let i = 0; i < byteString.length; i++) {    ia[i] = byteString.charCodeAt(i);  }  return new Blob([ia], { type: mimeString });},

const blob = dataURItoBlob(imgDataUrl);const formData = new FormData();// formData.append('auth', state.token.auth); 可以选择性的加入一些鉴权formData.append('file', blob);进行数据上传，我这里使用的是axiosconst params = {   url: '/store/file',   payload: formData }; const data = await this.upload(params);

export const upload = (params) => {  const { url, payload } = params  return axios.post(url, payload, {    headers: {      'Content-Type': 'multipart/form-data'    }  }).then(x => x.data)}