ajax的简单应用

页面绑定离焦函数–>离焦函数内写一个ajax–>java类处理并返回数据

**页面:**<td ><input type="text" id="contractId" onblur="queryContractInfo(this.value)"/></td>**函数:**function queryContractInfo(contractId){        $.post("queryContractInfo.do",{"contractId":contractId},function(data){            if(data.contractInfo == null){                alert("您输入的合同号不存在，请重新输入！");                return;            }            $("#bankCity").val(data.contractInfo.bankCity);            $("#userBankName").val(data.contractInfo.userBankName)        });    }**action:** public void queryContractInfo(){        String contractId = SqlInfusion.FilteSqlInfusion(request().getParameter("contractId"));        Map<String,Object> contractInfo = financeManageService.queryContractInfo(contractId);        try {            JSONObject obj = new JSONObject();            obj.put("contractInfo", contractInfo);            JSONUtils.printObject(obj);        } catch (Exception e) {            log.info(e.toString());        }    }