undefined value 中文意思是什麼
undefined value
解釋
無定義值-
If the value of this last parameter was not supplied by the caller, the value of the corresponding property is undefined
如果調用者沒提供最後一個參數的值，那麼對應屬性的值是無定義的。 -
The value of unspecified components is undefined
未定義未指定的部分的值。 -
But there is still only one value. undefined scalars contain the " undef " value. you shouldn t compare anything to undef, the way you would compare things to null in c c java
如果在c / c + + / java程序中，您可以將其他值與null比較，但在perl中卻不能拿任何東西來與" undef "做比較。 -
The nullable type modifier enables c to create value - type variables that indicate an undefined value
可空類型修飾符使c #能夠創建表示未定義值的值類型變量。 -
True undefined value
未定義的值 -
C 2. 0 introduces nullable types, which are data types that may be set to an undefined value
C # 2 . 0引入了可為空值的類型，這是可以設置成未定義值的數據類型。 -
They hold only one piece of data : a string, a number, the undefined value, a reference to another variable
它只保存一段數據：一個字元串、一個數字、未定義的值以及對另一個變量的引用。 -
In addition, because perl is looking for a true value, it also ignores undefined values without complaining about them
另外，由於perl正在尋找一個真值，因此它也可以忽略未定義的值，而不會抱怨這些值尚未定義。 -
Instead of checking for a default compound value, you can also catch the access to an undefined variable
不用再檢查默認的復合值，您也可以捕獲對未定義變量的訪問。 -
There is no value that signifies " undefined "
不存在表示「未定義」的值。 -
Nullable types allow a variable to contain a value that is undefined
可空類型允許變量包含未定義的值。 -
A null value is useful to indicate an undefined or unknown value
空值對于指示未定義的或未知的值很有用。 -
A nullable type can contain a value, or it can be undefined. the
可空類型可以包含值，或者可以是未定義的。 -
This means that the value of a local constant is undefined until the constant declaration statement is reached and that a local variable is undefined until the variable is assigned to in the function
這就意味著在到達常數聲明語句前局部常數值是未定義的，在函數中分配變量前局部變量是未定義的。
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