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

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