Why is v-if ineffective?

[Sorry, I made a mistake! The problem is closed. no, no, no. ]

the following code outputs both sentences in the browser. In addition,
< script src= "vue.js" > < / script >
.
< div Now you see me

< div v-else >
Now you don"t
< / div >

Mar.14,2021
The conditions of

are mutually exclusive and certainly cannot be output. Don't you have vue? installed here?
https://jsfiddle.net/SeverHo/.


https://jsfiddle.net/ffp3gna3/
cannot be reproduced, please check other codes

MySQL Query : SELECT * FROM `codeshelper`.`v9_news` WHERE status=99 AND catid='6' ORDER BY rand() LIMIT 5
MySQL Error : Disk full (/tmp/#sql-temptable-64f5-1b3b405-2c291.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1b3b405-2c291.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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