var UserObj =  
        {  
          userId:"",    
          userName:"",  
          roleId:""  ,
          roleName:""
        }  

function submitData() {
    var tb = document.getElementById(IDArray[0]);
    if (tb)
     {
    var rows = tb.rows;
    var ohjInfo;
    for (var i = 1; i < rows.length; i++) {
        var id = rows[i].cells[1].innerText;
        var name = rows[i].cells[2].innerHTML;
        var oDropDownList = rows[i].cells[3].childNodes[0];
        var oText = oDropDownList.options[oDropDownList.selectedIndex].text;
        var oValue = oDropDownList.options[oDropDownList.selectedIndex].value;
        UserObj.userId = id;
        UserObj.userName = name;
        UserObj.roleId = oValue;
        UserObj.roleName = oText;
        var objStr = Serialize(UserObj);  // js对象转化成json数据格式
        ohjInfo += objStr;
    }
    return ohjInfo;
    }
}

function Serialize(obj){      
     switch(obj.constructor){      
         case Object:      
             var str = "{";      
             for(var o in obj){      
                 str += o + ":" + Serialize(obj[o]) +",";      
             }      
             if(str.substr(str.length-1) == ",")      
                str = str.substr(0,str.length -1);      
              return str + "}";      
              break;      
          case Array:                  
              var str = "[";      
              for(var o in obj){      
                  str += Serialize(obj[o]) +",";      
              }      
              if(str.substr(str.length-1) == ",")      
                  str = str.substr(0,str.length -1);      
              return str + "]";      
              break;      
          case Boolean:      
              return "\"" + obj.toString() + "\"";      
              break;      
          case Date:      
              return "\"" + obj.toString() + "\"";      
              break;      
          case Function:      
              break;      
         case Number:      
              return "\"" + obj.toString() + "\"";      
              break;       
          case String:      

             return "\"" + obj.toString() + "\"";      
              break;          
      }      
  } 

aspx页面代码：

<input type="button"  onclick='<%=string.IsNullOrEmpty(OnClientSubmit)?"retrun false;":string.Format("if({0}) {0}(submitData());return false;",OnClientSubmit)%>' alt="确定" />

aspx.cs后台代码：

        public string OnClientSubmit
        {
            get
            {
                if (ViewState["OnClientSubmit"] != null)
                {
                    return ViewState["OnClientSubmit"].ToString();
                }
                else
                {
                    return "";
                }

            }
            set { ViewState["OnClientSubmit"] = value; }
        }