1. // 'data:application/apollo-zstd;version=1.1.1;base64,' 注意一下，后端返回的base64
    2. export function base64ToBlob(base64: string): Blob {
    3.   if (!base64) {
    4.       return;
    5.   }
    6.   const mimeString = base64.split(',')[0]
    7.       .split(':')[1]
    8.       .split(';')[0];
    9.   const byteString = atob(base64.split(',')[1]);
    10.   const arrayBuffer = new ArrayBuffer(byteString.length);
    11.   const intArray = new Uint8Array(arrayBuffer);
    12.   for (let i = 0; i < byteString.length; i++) {
    13.       intArray[i] = byteString.charCodeAt(i);
    14.   }
    15.   return new Blob([intArray], {type: mimeString});
    16. }
    1. public dataURLtoFile(dataurl: any, filename: any): any {
    2.     const arr = dataurl.split(',');
    3.     const mime = arr[0].match(/:(.*?);/)[1];
    4.     const bstr = atob(arr[1]);
    5.     let n = bstr.length;
    6.     const u8arr = new Uint8Array(n);
    7.     while (n--) {
    8.       u8arr[n] = bstr.charCodeAt(n);
    9.     }
    10.     return new File([u8arr], filename, { type: mime });
    11. }
    1.  const blob = new Blob([this.file.nativeElement.files[0]], { type: '' });
    2.  const formate = new FormData(); // 通过append(key,value)来添加数据
    3.  this.file.nativeElement.value = '';//  用于多次上传，要清空之前的值
    1. const aBlob = new Blob( array, options ); 
    3. export function downLoadFile(data: ArrayBuffer, fileNmame: string, type: string, fileType: string = 'xls'): void {
    4.   const blob = new Blob([data], { type });
    5.   const url = window.URL.createObjectURL(blob);
    6.   const eleLink = document.createElement('a');
    7.   eleLink.download = `${fileNmame}.${fileType}`;
    8.   eleLink.style.display = 'none';
    9.   eleLink.href = url;
    10.   // 触发点击
    11.   document.body.appendChild(eleLink);
    12.   eleLink.click();
    13.   // 然后移除
    14.   document.body.removeChild(eleLink);
    15. }