antd-cascader

nzOptions:value,label,children
其中：显示的是label，值为vlaue，有子结构的为children
eg：值为：
[“zhejiang”, “ningbo”]
回填值：
public values: any[] = [‘zhejiang’, ‘hangzhou’, ‘xihu’];
nzAllowClear:是否支持清除.boolean:默认：true;

ts:

public options = [{
    value: 'zhejiang',
    label: '浙江',
    children: [{
      value: 'hangzhou',
      label: '杭州',
      children: [{
        value: 'xihu',
        label: '西湖',
        isLeaf: true
      }]
    }, {
      value: 'ningbo',
      label: '宁波',
      isLeaf: true
    }]
  }, {
    value: 'jiangsu',
    label: '江苏',
    children: [{
      value: 'nanjing',
      label: '南京',
      children: [{
        value: 'zhonghuamen',
        label: '中华门',
        isLeaf: true
      }]
    }]
  }];
  /** init data */
  public nzOptions = this.options;

  /** ngModel value */
  public values: any[] = ['zhejiang', 'hangzhou', 'xihu'];
  /* // or like this:
  public values: any[] = [{
    value: 'zhejiang',
    label: 'Zhejiang'
  }, {
    value: 'hangzhou',
    label: 'Hangzhou'
  }, {
    value: 'xihu',
    label: 'West Lake'
  }]; */

  public onChanges(values: any): void {
    console.log("级联的值：", this.values);
  }