如何用一个按钮来控制画布开启或者关闭画布的自动布局，比如，用户手动拖动，保存用当前位置信息重新渲染画布了，可是想回到之前自动布局的状态，如何控制画布的自动布局的开启呢？…
Maybe it’s a problem with the translation of your question, but layouts just arrange the locations of the nodes and route the links connecting those nodes. Layouts are not opened and closed.
So I am guessing that you have set Diagram.layout to some Layout with Layout.isInitial set to false so that loading a model does not lose the locations assigned to the nodes via a data Binding. And now are you asking about how to force a layout to occur? If so, just call Diagram.layoutDiagram with an argument of true.
Read more about this at GoJS Layouts -- Northwoods Software