the problem has been resolved

use : class= "["message-box"]" array instead

Thank you @ Distance for reminding me, but his method doesn"t work either, because my className is written in < style > , not a style object

problem description

use the latest version of weex, and the front-end framework uses vue

< template > part of the code:

  https://weex.apache.org/guide.

 which part of the document has this description?