fastadmin 列宽度修改，超过长度的用省略号替代

cellStyle : function(value, row, index, field){
                                return {
                                    css: {
                                        "white-space": "nowrap",
                                        "text-overflow": "ellipsis",
                                        "overflow": "hidden",
                                        "max-width":"300px"
                                    }
                                };
                            }