line

官网线条：https://echarts.apache.org/zh/option.html#graphic.elements-line

const lineObj = {
  id: 'line_id',
  type: 'line',
  shape: {
    x1: 1,
    y1: 2,
    x2: 1,
    y2: 50
  },
  style: {
    stroke: 'rgba(21,197,130, 0.9)',
    lineDash:[3, 3],
  },
  z: 100
};