
    <nz-tree-select [nzNodes]="nodes" nzSuffixIcon="smile" [(ngModel)]="value" nzDefaultExpandAll></nz-tree-select>
    <br />
    <br />
    <nz-tree-select [nzNodes]="nodes" nzPrefix="Prefix" [(ngModel)]="value" nzDefaultExpandAll></nz-tree-select>
  