go.js：节点拖拽功能失效

设置

fromLinkable：false

即获取或设置用户是否可以从此端口绘制链接

objGo(
          go.TextBlock,
          {fromLinkable: false,toLinkable: false},
          {
            font: "bold 11pt Helvetica, Arial, sans-serif",
            margin: 8,
            maxSize: new go.Size(160, NaN),
            wrap: go.TextBlock.WrapFit
            // editable: true
          },
          new go.Binding("text").makeTwoWay()
        )