Mini Program canvas characters cannot be bold

Mini Program draws the text with canvas, and sets the text to be bold but does not respond. The code is as follows

      ctx.font=`50px bold`
      ctx.fillText("",0,0)

Canvas html5 Mini-Program

Dec.21,2021

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Front-end canvas html5 Mini-Program javascript

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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-64f5-1be5c87-317c4.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1be5c87-317c4.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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