GoJS是一款功能強(qiáng)大，快速且輕量級的流程圖控件，可幫助你在JavaScript 和HTML5 Canvas程序中創(chuàng)建流程圖，且極大地簡化您的JavaScript / Canvas 程序。

點(diǎn)擊下載GoJS最新版

從2.0版本開始，GoJS可以用于沒有DOM的上下文中，例如Node.js。但是，有一些注意事項(xiàng)：

• 由于沒有圖DIV，因此必須設(shè)置Diagram.viewSize屬性。這會(huì)影響所有與DIV大小相同的值，例如Diagram.position和視口大小的布局的布局結(jié)果。
• 無法測量go.Pictures，必須改為設(shè)置GraphObject.desiredSize。
• 無法準(zhǔn)確測量go.TextBlocks，應(yīng)改為設(shè)置GraphObject.desiredSize。

Node.js示例

如果將以下JavaScript另存為nodescript.js，并與節(jié)點(diǎn)（node nodescript.js）一起運(yùn)行，它將在控制臺中輸出Model JSON結(jié)果，其中包括布局節(jié)點(diǎn)的位置。您可以通過這種方式使用Node.js進(jìn)行大型布局之類的服務(wù)器端操作，然后將JSON發(fā)送給客戶端。

// nodescript.js
// This example loads the GoJS library, creates a Diagram with a layout and prints the JSON results.

// Load GoJS.  This assumes using require and CommonJS:
const go = require("gojs");

const $ = go.GraphObject.make;  // for conciseness in defining templates

const myDiagram =
  $(go.Diagram, '', // No DOM, so there can be no DIV!
    {
      viewSize: new go.Size(400,400), // Set this property in DOM-less environments
      layout: $(go.LayeredDigraphLayout)
    });

myDiagram.nodeTemplate =
  $(go.Node, 'Auto',
    // specify the size of the node rather than measuring the size of the text
    { width: 80, height: 40 },
    // automatically save the Node.location to the node's data object
    new go.Binding('location', 'loc', go.Point.parse).makeTwoWay(go.Point.stringify),
    $(go.Shape, 'RoundedRectangle', { strokeWidth: 0},
      new go.Binding('fill', 'color')),
    $(go.TextBlock,
      new go.Binding('text', 'key'))
  );

// After the layout, output results:
myDiagram.addDiagramListener('InitialLayoutCompleted', function() {
  console.log(myDiagram.model.toJson());
});

// load a model:
myDiagram.model = new go.GraphLinksModel(
[
  { key: 'Alpha', color: 'lightblue' },
  { key: 'Beta', color: 'orange' },
  { key: 'Gamma', color: 'lightgreen' },
  { key: 'Delta', color: 'pink' }
],
[
  { from: 'Alpha', to: 'Beta' },
  { from: 'Alpha', to: 'Gamma' },
  { from: 'Gamma', to: 'Delta' },
  { from: 'Delta', to: 'Alpha' }
]);

// nodescript.mjs
// This example loads the GoJS library, creates a Diagram with a layout and prints the JSON results.

// Load GoJS.  This assumes using import and ES6 modules:
import * as go from "gojs/release/go.mjs";

const $ = go.GraphObject.make;
. . .