blockly > BasicCursor > prev
BasicCursor.prev() 方法
在先序遍歷中尋找前一個節點。
Signature:
prev(): ASTNode | null;
退貨:
ASTNode | 空值
前一個節點,如果未設定目前節點或沒有先前的值,則傳回空值。
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上次更新時間:2024-11-08 (世界標準時間)。
[null,null,["上次更新時間:2024-11-08 (世界標準時間)。"],[[["The `BasicCursor.prev()` method is used to navigate to the previous node in the pre-order traversal of an Abstract Syntax Tree (AST)."],["It returns the previous ASTNode or null if the current node isn't set or if there's no preceding node."],["This method helps in traversing the AST structure by providing a way to access the previous node in the sequence."]]],["The `BasicCursor.prev()` method locates the preceding node in a pre-order traversal. It returns an `ASTNode` object representing this previous node. If no previous node exists or the current node is unset, the method returns `null`. The method's signature is `prev(): ASTNode | null;`, indicating the type of data it returns.\n"]]