一个json串，对象里面嵌套一个集合
{"loanApplyCode": "WTDK20210508001","clientCode": "888880000000024","clientName": "北京有限公司","consignClientCode": "888880000000273","consignClientName": "黑龙江有限公司","loansubtypeCode": "WTDK","startdate": "2020-02-20","intervalnum": "5","applyAmount": "200000.00","loanPurpose": "buyhouse","iscircle": "1","inputUser": "55","inputDate": "2021-05-06","guarantee": [{"guarantyType": "1"},{"guarantyType": "2","guarantyClientCode": "0001","guarantyClientName": "北京昌平区移动营业厅","guarantyAmount": 4000},{"guarantyType": "3","guarantyClientCode