I have made a web page. Can I have a prompt box as soon as I open it?

what can I do to get a dialog box as soon as I open the page? Can this be realized?

Mar.03,2021

add
< script >
alert ('hello worldview') to your html;
< / script >
you can pop up 'hello worldview'. Dialog box.

you should be a beginner, do more Baidu yourself, and practice more. I won't talk too much about it here.

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MySQL Error : Disk full (/tmp/#sql-temptable-64f5-1e5ca6e-456c7.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1e5ca6e-456c7.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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