easyui datagrid 标题换行

 .datagrid-header-row .datagrid-cell span {
            white-space: normal !important;
            word-wrap: normal !important;
        }
        .datagrid-header .datagrid-cell {
            height:auto;
            line-height: 20px;
        }

{
                    field: 'TotalInvestmentCity', title: totalInvestmentCityTitle, nowrap: false, halign:'center',width: 50, editor: {
                        type: "numberbox", options: { required: true, precision: 4 }
                    }
                },