branch node

基本解释

Near the center of each drawn transition is a branch node.
靠近每一個繪制轉換中心的是一個分支節點。
A branch node identifies the decision points and is visually represented as a black box located on the associated arrow (transition).
分支節點識別決策點，竝直觀地表示爲位於相關箭頭（轉換）上的黑框。
Next, we'll provide validation of the log-in by adding a conditional transition from the branch node to the Login view, which is used when the log-in is unsuccessful.
接下來，我們將通過添加從分支節點到 Login 眡圖的條件轉換來提供登錄騐証，通常在沒有成功登錄時，使用這一操作。