V-charts x轴 字体宽度修改

<label>生产效率</label>
        <ve-histogram
          :data="todayProNumRateData"
          :settings="todayProNumRateSettings"
          :extend="proEffChartExtend"//这是重点代码
        ></ve-histogram>

this.proEffChartExtend = {
      series: {
        barWidth: 30  //这就是宽度
      },
      xAxisType: "value",
      xAxis: {
        axisLabel: {
          interval: 0,
          //换行显示
          formatter: function(value) {
            let result = ""; //拼接加\n返回的类目项
            let maxLength = 4; //每项显示文字个数
            let valLength = value.length; //X轴类目项的文字个数
            let rowNumber = Math.ceil(valLength / maxLength); //类目项需要换行的行数
            if (rowNumber > 1) {
              //如果文字大于3,
              for (let i = 0; i < rowNumber; i++) {
                let temp = ""; //每次截取的字符串
                let start = i * maxLength; //开始截取的位置
                let end = start + maxLength; //结束截取的位置
                temp = value.substring(start, end) + "\n";
                result += temp; //拼接生成最终的字符串
              }
              return "{labelText|" + result + "}";
            } else {
              return "{labelText|" + value + "}";
            }
          },
          rich: {
            labelText: {
              lineHeight: 18
            }
          }
        }
      },
      color: "#d87a80"
    };