el-select两个下拉框实现二级联动

参考
参考

//两个下拉框的子集关系
    const subRelation = () => {
      primaryDiagnosisMore.value = [];
      data.initialDiagnosisMore = '';
      for (const i of primaryDiagnosis.value){
        console.log('i', i);
        if (data.initialDiagnosis === i.typeName) {
          primaryDiagnosisMore.value = i.children;
        }
      }
    };