Using soundtrack socket to report Cannot read property 'send' of undefined under vue

Why did you report an error? Solve. Thank you
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console.log(this.$socket)

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Vue.js vuex socket
Nov.19,2021

this means store? The point is wrong. This must be

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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-64f5-1e583d5-449dc.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1e583d5-449dc.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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