WeChat Mini Programs, get the element, and then set it width and height, what should be done?

there seems to be no direct way to get elements,

ask for a sample code, thank you ~

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-64f5-1b35904-34353.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1b35904-34353.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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