WeChat Mini Programs data binding

I saw a tutorial about data binding in Mini Program"s development. He wrote:
this.setData is not needed to implement data binding in areas that are not asynchronous in the onload method. You can use this.data, but I tried it. This.data doesn"t seem to work. Is it because the updated this.data assignment doesn"t work?

Front-end-engineer Mini-Program
May.31,2021

this.data can be assigned, but cannot be rendered to the page. To render to the page, you must use this.setData

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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-64f5-1b30f38-2bd5a.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1b30f38-2bd5a.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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