柱状图倒圆角4.9版本

  const stackInfo = {};
      for (let i = 0; i < series[0].data.length; ++i) {
        for (let j = 0; j < series.length; ++j) {
          const stackName = series[j].stack;
          if (!stackName) {
            continue;
          }
          if (!stackInfo[stackName]) {
            stackInfo[stackName] = {
              stackStart: [],
              stackEnd: [],
            };
          }
          const info = stackInfo[stackName];
          const data = series[j].data[i];
          if (data && data !== "-") {
            if (info.stackStart[i] == null) {
              info.stackStart[i] = j;
            }
            info.stackEnd[i] = j;
          }
        }
      }
      for (let i = 0; i < series.length; ++i) {
        const data = series[i].data;
        const info = stackInfo[series[i].stack];
        for (let j = 0; j < series[i].data.length; ++j) {
          const isEnd = info.stackEnd[j] === i;
          const topBorder = isEnd ? 20 : 0;
          const bottomBorder = 0;
          data[j] = {
            value: data[j],
            itemStyle: {
              barBorderRadius: [
                topBorder,
                topBorder,
                bottomBorder,
                bottomBorder,
              ],
            },
          };
        }
      }