JavaScript中怎么设置toolBar的按钮居右

代码是这样的

toolBar: [
                    {
                        icon: '../../img/icon/fold.png',
                        text: '导出模板',
                        onClick: exportData
                    },
                    {
                        icon: '../../img/icon/unfold.png',
                        text: '导入',
                        onClick: importData
                    },
                    {
                        icon: '../../img/icon/upload.png',
                        text: '批量提交',
                        onClick: batchCommit
                    }
 ],

我想让最后一个“批量提交”按钮显示在右边，试了几个方法都不行，哪位大哥来帮帮忙