echarts如何优化数据视图dataView中的样式（代码示例）

toolbox:{   show: true,  feature: {     dataView: {         show: true,         title: '数据视图',         optionToContent: function (opt) {         var axisData = opt.xAxis[0].data;         var series = opt.series;         var tdHeads = '<td  style="padding:0 10px">名称</td>';         series.forEach(function (item) {         tdHeads += '<td style="padding: 0 10px">'+item.name+'</td>';         });         var table = '<table border="1" style="margin-left:20px;border-collapse:collapse;font-size:14px;text-align:center"><tbody><tr>'+tdHeads+'</tr>';         var tdBodys = '';         for (var i = 0, l = axisData.length; i < l; i++) {         for (var j = 0; j < series.length; j++) {         if(typeof(series[j].data[i]) == 'object'){         tdBodys += '<td>'+series[j].data[i].value+'</td>';         }else{             tdBodys += '<td>'+ series[j].data[i]+'</td>';            }        }        table += '<tr><td style="padding: 0 10px">'+axisData[i]+'</td>'+ tdBodys +'</tr>';        tdBodys = '';       }       table += '</tbody></table>';       return table;      }    },    mark: {show:true},    restore:{show:true},   magicType: {type: ['line', 'bar','pie']},   saveAsImage:{show:true}        }    }