easyui datagrid 实现单选并能取消单选

var intjavadillcheck=0;
var rowjavadillselect=null;
function ghm_getPageListCallback(result){
    if(result==-3333){
        $.messager.show({title:'系统提示',msg:'您没有该操作的权限！',timeout:2000});
        return;
    }else if(result== -201 || result==-111){
        $.messager.show({title:'系统提示',msg:'参数错误！',timeout:2000});
        return;
    }else{
        guestManageArray_highLevel= result;
        $('#tab_client_guestHighLevel_manage').datagrid({
            loader:guestManageLoader_highLevel,
            title : '客源高级信息列表',         //表格标题
            iconCls : 'icon-list',  //表格图标
            nowrap : false,         //是否只显示一行，即文本过多是否省略部分。
            fitColumns : true,         //防止水平滚动
            scrollbarSize : 0,         //去掉右侧滚动条列
            collapsible : false,    //是否可折叠的
            striped:true,//隔行变色
            loadMsg : "loading....",
            singleSelect:true,
            rownumbers:true,
            fit:true,
            checkOnSelect:false,//关键设置
            onClickRow : function(rowIndex,rowData){
                if(intjavadillcheck==2){
                    intjavadillcheck=0;
                    return;
                }else{
                    intjavadillcheck=1;
                }

                var rows = $('#tab_client_guestHighLevel_manage').datagrid('getChecked');
                var flag = true;
                for(var i = 0; i < rows.length; i++) {
                    if(rowData == rows[i]){
                    flag = false;
                    break;
                    }
                }

                if(flag){
                    $('#tab_client_guestHighLevel_manage').datagrid('checkRow',rowIndex);
                    $('#tab_client_guestHighLevel_manage').datagrid('selectRow',rowIndex);
                    rowjavadillselect = $('#tab_client_guestHighLevel_manage').datagrid('getSelected');
                }
                else{
                    $('#tab_client_guestHighLevel_manage').datagrid('uncheckRow',rowIndex);
                    $('#tab_client_guestHighLevel_manage').datagrid('unselectRow',rowIndex);
                    rowjavadillselect=null;
                }

                intjavadillcheck=0;
                },
            onCheck:function(rowIndex,rowData){
            if(intjavadillcheck==2){
                return;
                }

            if(intjavadillcheck==1){
                intjavadillcheck=0;
                return;
                }else{
                    intjavadillcheck=2;
                }

            if(rowData != rowjavadillselect){
                $('#tab_client_guestHighLevel_manage').datagrid('checkRow',rowIndex);
                $('#tab_client_guestHighLevel_manage').datagrid('selectRow',rowIndex);
                rowjavadillselect = $('#tab_client_guestHighLevel_manage').datagrid('getSelected');
            }else{
                $('#tab_client_guestHighLevel_manage').datagrid('uncheckRow',rowIndex);
                $('#tab_client_guestHighLevel_manage').datagrid('unselectRow',rowIndex);
                rowjavadillselect=null;
            }

            intjavadillcheck=0;
            },