uniapp mqtt

uniapp android

使用mqtt : npm install mqtt

04:26:28.669 [Vue warn]: Unhandled error during execution of created hook
at <IndexpageId=1pagePath="pages/index/index"__pageQuery={} ...>
04:26:28.670 TypeError: WS is not a constructor

hbuilderx 4.5.7

请问这是什么原因