
    <nz-spin [nzSpinning]="isSpinning" [nzDelay]="500">
      <nz-alert
        nzType="info"
        nzMessage="Alert message title"
        nzDescription="Further details about the context of this alert."
      ></nz-alert>
    </nz-spin>
    <br />
    <div>
      Loading state：
      <nz-switch [(ngModel)]="isSpinning"></nz-switch>
    </div>
  