Menu
×
   ❮     
HTML CSS JAVASCRIPT SQL PYTHON JAVA PHP HOW TO W3.CSS C C++ C# BOOTSTRAP REACT MYSQL JQUERY EXCEL XML DJANGO NUMPY PANDAS NODEJS R TYPESCRIPT ANGULAR GIT POSTGRESQL MONGODB ASP AI GO KOTLIN SASS VUE DSA GEN AI SCIPY AWS CYBERSECURITY DATA SCIENCE
     ❯   

VBScript IsEmpty 函数


❮ VBScript 完整参考

IsEmpty 函数返回一个布尔值,指示指定的变量是否已初始化。如果变量未初始化,则返回 True;否则,返回 False。

语法

IsEmpty(expression)

参数 描述
expression 必需。表达式(通常是变量名)

示例

示例

<%

Dim x
response.write(IsEmpty(x) & "<br />")
x=10
response.write(IsEmpty(x) & "<br />")
x=Empty
response.write(IsEmpty(x) & "<br />")
x=Null
response.write(IsEmpty(x))

%>

以上代码的输出将是

True
False
True
False
显示示例 »

❮ VBScript 完整参考
×

Contact Sales

If you want to use W3Schools services as an educational institution, team or enterprise, send us an e-mail:
[email protected]

Report Error

If you want to report an error, or if you want to make a suggestion, send us an e-mail:
[email protected]

W3Schools is optimized for learning and training. Examples might be simplified to improve reading and learning. Tutorials, references, and examples are constantly reviewed to avoid errors, but we cannot warrant full correctness of all content. While using W3Schools, you agree to have read and accepted our terms of use, cookie and privacy policy.

Copyright 1999-2024 by Refsnes Data. All Rights Reserved. W3Schools is Powered by W3.CSS.