echarts中折线图切换为数据视图（表格布局）表头无法对齐解决方法

            dataView: {

              show: true,

              readOnly: true,

              optionToContent: function (opt) {

　　　　  // console.log(opt) 

                //该函数可以自定义列表为table，opt是给我们提供的原始数据的obj。 可打印出来数据结构查看

                var axisData = opt.xAxis[0].data; //坐标轴

                var series = opt.series; //折线图的数据

                var tdHeads =

                  '<td  style="margin-top:10px; padding: 0 15px">日期</td>'; //表头

                var tdBodys = "";

                series.forEach(function (item) {

                  tdHeads += `<td style="padding:5px 15px">${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>`;

                for (var i = 0, l = axisData.length; i < l; i++) {

                  for (var j = 0; j < series.length; j++) {

                    if (series[j].data[i] == undefined) {

                      tdBodys += `<td>${"-"}</td>`;

                    } else {

                      tdBodys += `<td>${series[j].data[i]}</td>`;

                    }

                  }

                  table += `<tr><td style="padding: 0 15px">${axisData[i]}</td>${tdBodys}</tr>`;

                  tdBodys = "";

                }

                table += "</tbody></table>";

                return table;

              },

              contentToOption: function (HTMLDomElement, opt) {

                return opt;

              },

            },