medical/node_modules/echarts/lib/chart/tree/treeAction.js

var echarts = require("../../echarts");

echarts.registerAction({
  type: 'treeExpandAndCollapse',
  event: 'treeExpandAndCollapse',
  update: 'update'
}, function (payload, ecModel) {
  ecModel.eachComponent({
    mainType: 'series',
    subType: 'tree',
    query: payload
  }, function (seriesModel) {
    var dataIndex = payload.dataIndex;
    var tree = seriesModel.getData().tree;
    var node = tree.getNodeByDataIndex(dataIndex);
    node.isExpand = !node.isExpand;
  });
});