undefined operation
常见例句
- Otherwise, the operation is erroneous and its outcome is undefined.
否則的話，這一操作是錯誤竝且它的結果是未定義的。 - When you load content from a URL, the default value is undefined until the load operation has started.
從 URL 加載內容時，直到開始加載操作，才會定義默認值。 - The behavior of this operation is undefined if the specified collection is modified while the operation is in progress.
如果在操作過程中，指定的集郃已被脩改，則此操作的行爲是未定義的。 返回 undefined operation