element-ui/packages/tree/src/model/util.js

A Component Library for Vue.js.

export const NODE_KEY = '$treeNodeId';

export const markNodeData = function(node, data) {
  if (data[NODE_KEY]) return;
  Object.defineProperty(data, NODE_KEY, {
    value: node.id,
    enumerable: false,
    configurable: false,
    writable: false
  });
};

export const getNodeKey = function(key, data) {
  if (!key) return data[NODE_KEY];
  return data[key];
};