前端向后端action参数传递问题

sandgia

var pageData=this.comp("pageData");
var designDocsData=this.comp("designDocsData");
tableMap={};
tableMap.pageData=pageData;
tableMap.designDocsData=designDocsData;
//进行一些校验

//将pass转化为json的字符串


//进行信息的保存
        var params = new biz.Request.ActionParam();
        params.setMap("tableMap", tableMap );        
        var res = biz.Request.sendBizRequest({
            "context" : this.getContext(),
            "directExecute" : true,
            "parameters" : params,
            "action" : "pageSave",
            "callback" : function(callbackData) {
                callbackData.ignoreError = false;
                if (callbackData.state) {   
                alert("成功")
                }
            }
        });

结果报错：

this.param[t].toJson is not a function
[url=]隐藏详细[/url]
TypeError: this.param[t].toJson is not a function at _var_._ActionParam.toJson (http://localhost:8080/x5/UI2/v_92d74322fb3f409493e0e2a49cf513a0l_zh_CNs_desktopd_pc/system/biz.common.min.js:12:24422) at _var_._ActionParam.to (http://localhost:8080/x5/UI2/v_92d74322fb3f409493e0e2a49cf513a0l_zh_CNs_desktopd_pc/system/biz.common.min.js:12:24496) at Object.Request.createBizParam (http://localhost:8080/x5/UI2/v_92d74322fb3f409493e0e2a49cf513a0l_zh_CNs_desktopd_pc/system/biz.common.min.js:12:14513) at Object.$var._sendBizRequest (eval at __actionFinish (http://localhost:8080/x5/UI2/v_92d74322fb3f409493e0e2a49cf513a0l_zh_CNs_desktopd_pc/system/biz.common.min.js:12:16366), <anonymous>:1:135) at Object.Request.sendBizRequest (http://localhost:8080/x5/UI2/v_92d74322fb3f409493e0e2a49cf513a0l_zh_CNs_desktopd_pc/system/biz.common.min.js:12:15521) at n.Model.test2Click (http://localhost:8080/x5/UI2/v_8a0b0e5cf17740f88ad1e8e45b06787fl_zh_CNs_desktopd_pc/ERP/BUILDCO/Review/process/BuildingReview/mainActivity.js:342:25) at n.fire (http://localhost:8080/x5/UI2/v_2d0d1794e19b497981d6299a95a1e2del_zh_CNs_desktopd_pc/system/core.min.js:65:234367) at n.fireEvent (http://localhost:8080/x5/UI2/v_2d0d1794e19b497981d6299a95a1e2del_zh_CNs_desktopd_pc/system/core.min.js:65:235531) at n.callParent (http://localhost:8080/x5/UI2/v_2d0d1794e19b497981d6299a95a1e2del_zh_CNs_desktopd_pc/system/core.min.js:65:231806) at n.fireEvent (http://localhost:8080/x5/UI2/v_02a3cc53b9da4f9cba9033212ec42e32l_zh_CNs_desktopd_pc/system/common.min.js:7:3704)

问题：
什么原因，是不是map参数的问题，如果是，错在什么地方？怎么修改？

jishuang

this.param[t].toJson什么地方写的？