获取返回json元素下面的元素的方法

"data": {
"checkFlag": 0,
"clientIp": "",
"department": null,
"description": null,
"email": null,
"ismanager": 1,
"loginame": "samcs",
"orgpwd": "",
"pageNo": 1,
"pageSize": 10,
"password": "123456",
"phonenum": null,
"position": null,
"showModel": {
"msgTip": "user can login"
},
"userID": 0,
"userIDs": "",
"username": ""
},

这个是我返回的json数据，我现在想获取到"user can login",这个值，这个值是在"showModel"下面的"msgTip"下的值，在uni-app项目下怎样获取，谢谢！