Echarts中legend中动态渲染数据不显示的问题

之前我是直接将数据赋值给legend的，但是数据不显示

后来，百度了发现需要先将数据赋值给一个对象（命名随意，我这里使用abc）,再将对象赋值给legend

完整代码如下

<script>
  $.get('lib/echarts/data4.json', function (data) {
    //与服务器连接成功
    myChart.setOption(option = {
      legend: {

      },
      tooltip: {},
      xAxis: {
        data: data.name
      },
      yAxis: {},
      series: [
        {
          name: data.year[0],
          type: 'bar',
          data: data.data,
          itemStyle: {
            normal: {
              color: 'rgb(97, 160, 168)'
            },
            emphasis: {
              shadowBlur: 6,
              shadowOffsetX: 0,
              shadowColor: 'rgba(119, 168, 173,0.5)'
            }
          }
        },
        {
          name: data.year[1],
          type: 'bar',
          data: data.data1,
          itemStyle: {
            normal: {
              color: 'rgb(212, 130, 101)'
            },
            emphasis: {
              shadowBlur: 6,
              shadowOffsetX: 0,
              shadowColor: 'rgba(208, 145, 122,0.5)'
            }
          }
        },
        {
          name: data.year[2],
          type: 'bar',
          data: data.data2,
          itemStyle: {
            normal: {
              color: 'rgb(145, 199, 174)'
            },
            emphasis: {
              shadowBlur: 6,
              shadowOffsetX: 0,
              shadowColor: 'rgba(156, 197, 178,0.5)'
            }
          }
        },
      ]
    });
    var abc = {
      data: data.year
    };
    option.legend = abc;
  });
  var dom = document.getElementById("container");
  var myChart = echarts.init(dom);</script>

　　data4.json代码如下

{
  "year":[2018,2019,2020],
  "name":["1月","2月","3月","4月","5月","6月","7月","8月","9月","10月","11月","12月"],
  "data":[12, 25,45 , 9,35, 16, 8,25,15 , 6,18, 9],
  "data1":[10, 8,20 , 9,35, 20, 8,35,20 , 12,23, 9],
  "data2":[25, 12,35 , 9,35, 12, 12,20,15 , 35,15, 12]
}

　　实现效果如下