我有一个layui编写的页面，当后端正常返回时显示正常问题，但是后端返回失败信息（但是返回码还是200）时就显示异常。涉及代码如下：
def vhosthis_sync():
querydata = g.session.query(VhostInfo, BusinessInfo).join(BusinessInfo, VhostInfo.bus_id == BusinessInfo.ename).filter(VhostInfo.status == VhostInfoStatus.ARCHIVE)
host_type = g.session.query(ParamDefined).filter(ParamDefined.dtype == 'modules').all()
hosttypedict = {}
for host_type_item in host_type:
hosttypedict[host_type_item.dkey] = host_type_item.dvalue
acount = querydata.count()
results = querydata.all()
try:
for vhostinfo, businessinfo in results:
vhostinfohis = VhostInfoHis()
if vhostinfo.host_type in hosttypedict.keys():
vhostinfohis.dvalue = hosttypedict[vhostinfo.host_type]
else:
vhostinfohis.dvalue = '待分类'
for key,value in vars(vhostinfo).items():
if hasattr(vhostinfohis,key):
setattr(vhostinfohis,key,value)
for key,value in vars(businessinfo).items():
if hasattr(vhostinfohis,key):
setattr(vhostinfohis,key,value)
print(vars(vhostinfohis))
g.session.add(vhostinfohis)
g.session.commit()
return jsonify({'code': 200,'msg':'同步成功，本次同步数据量：'+str(acount)})
except Exception as e:
print(e)
return jsonify({'code':400,'msg':str(e.args)})
...