formDataの一括アップロードについて配列による一括およびbase 64によるformData変換

} let formData = new FormData() let files = [] if(this.clickCameraNUm == 1){ files = this.imgPreviewArr } else if(this.clickCameraNUm == 2){ files = this.imgListBefore } else if(this.clickCameraNUm == 3) { files = this.imgListAfter }

  let file = []
    files.forEach((item,index)=>{
      // base64 formData
      let bytes = window.atob(item.split(',')[1]);
      let array = [];
      for(let i = 0; i < bytes.length; i++){
          array.push(bytes.charCodeAt(i));
      }
      let blob = new Blob([new Uint8Array(array)], {type: 'image/png'});
       formData.append(`file[${index}]`,blob,Date.now() + '.png')   //  formData          
    })
    if(files.length > 0){
      this.loadingButton = true
      uploadImg(formData).then(res => {
        if(res.data&& res.data.length>0){
          let fileKeyArr = res.data