添加项目文件。

Epost.TestToolsWeb/Content/code/es-modules/mixins/nodes.js

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+import H from '../parts/Globals.js';
+
+H.NodesMixin = {
+    // Create a single node that holds information on incoming and outgoing
+    // links.
+    createNode: function (id) {
+
+        function findById(nodes, id) {
+            return H.find(nodes, function (node) {
+                return node.id === id;
+            });
+        }
+
+        var node = findById(this.nodes, id),
+            PointClass = this.pointClass,
+            options;
+
+        if (!node) {
+            options = this.options.nodes && findById(this.options.nodes, id);
+            node = (new PointClass()).init(
+                this,
+                H.extend({
+                    className: 'highcharts-node',
+                    isNode: true,
+                    id: id,
+                    y: 1 // Pass isNull test
+                }, options)
+            );
+            node.linksTo = [];
+            node.linksFrom = [];
+            node.formatPrefix = 'node';
+            node.name = node.name || node.options.id; // for use in formats
+
+            // Return the largest sum of either the incoming or outgoing links.
+            node.getSum = function () {
+                var sumTo = 0,
+                    sumFrom = 0;
+                node.linksTo.forEach(function (link) {
+                    sumTo += link.weight;
+                });
+                node.linksFrom.forEach(function (link) {
+                    sumFrom += link.weight;
+                });
+                return Math.max(sumTo, sumFrom);
+            };
+            // Get the offset in weight values of a point/link.
+            node.offset = function (point, coll) {
+                var offset = 0;
+                for (var i = 0; i < node[coll].length; i++) {
+                    if (node[coll][i] === point) {
+                        return offset;
+                    }
+                    offset += node[coll][i].weight;
+                }
+            };
+
+            // Return true if the node has a shape, otherwise all links are
+            // outgoing.
+            node.hasShape = function () {
+                var outgoing = 0;
+                node.linksTo.forEach(function (link) {
+                    if (link.outgoing) {
+                        outgoing++;
+                    }
+                });
+                return !node.linksTo.length || outgoing !== node.linksTo.length;
+            };
+
+            this.nodes.push(node);
+        }
+        return node;
+    }
+};