给数组换键名

       this.treeData = JSON.parse(
            JSON.stringify(res.data)
              .replace(/gradeId/g, 'id')
              .replace(/gradeName/g, 'name')
              .replace(/classList/g, 'children')
              .replace(/classId/g, 'id')
              .replace(/className/g, 'name')
              .replace(/studentList/g, 'children')
              .replace(/studentId/g, 'id')
              .replace(/studentName/g, 'name')
              .replace(/studentAccount/g, 'account')
          )