vue leader-line-vue

import LeaderLine from 'leader-line-vue';

methods: {
getLine(abstracts) {
      this.lines = []
      for (let j = 0; j < abstracts.length; j++) {
        let relationship = abstracts[j]["relation"]
        for (let i = 0; i < relationship.length; i++) {
          let first_e_id = relationship[i]["first_e_id"]
          let second_e_id = relationship[i]["second_e_id"]
          let first_e_id_start = relationship[i]["first_e_id_start"]
          let first_e_id_end = relationship[i]["first_e_id_end"]
          let second_e_id_start = relationship[i]["second_e_id_start"]
          let second_e_id_end = relationship[i]["second_e_id_end"]
          this.$nextTick(() => {
            const line = LeaderLine.setLine(
              LeaderLine.obj.pointAnchor(
                document.getElementById(j + "_" + first_e_id), {
                  x: (first_e_id_end - first_e_id_start) / 2 * 10,
                  y: 0
                }
              ),
              LeaderLine.obj.pointAnchor(
                document.getElementById(j + "_" + second_e_id), {
                  x: (second_e_id_end - second_e_id_start) / 2 * 10,
                  y: 0
                }
              ),
              {
                color: '#000000',
                size: 3,
                path: 'grid', //straight arc fluid magnet grid
                endPlug: 'arrow1', // behind arrow1
                endPlugSize: 1,
                middleLabel: LeaderLine.obj.pathLabel('blank', {color: 'black'}),
                startSocket: 'left',
                endSocket: 'right',
                //拉动引线 [+右/-左   +下/-上]
                startSocketGravity: [0, -5],
                endSocketGravity: [0, -10]
              }
            );
            this.lines.push({"e_id": first_e_id, "relation_id": relationship["id"], "line": line})
          });
        }
      }
      for (let i = 0; i < this.lines.length; i++) {
        this.lines[i]["line"].show()
      }
    },
}