环境：vue3+nvue
复现：运行后，横向滚动之后报错
初步原因：nvueScrollHandler在minx里面的ref
文件：
index.zip
680B
报错内容：
13:12:24.817 [Vue warn]: Unhandled error during execution of native event handler
 at <FuiHorizontalScrollscroll=false>
 at <BirthdayIndex__pageId=4__pagePath="pages/birthday/index"__pageQuery={}>
13:12:24.817 [JS Framework] Failed to invoke the event handler of "scroll" on scroller (482):
 TypeError: Cannot read property 'ref' of undefined
13:12:24.821 reportJSException >>>> exception function:__WEEX_CALL_JAVASCRIPT__, exception:JavaScript execute error!Uncaught TypeError: Cannot read property 'ref' of undefined
 at getEl (/pages/birthday/index.nvue:1060:31)
 at nvueScrollHandler (/pages/birthday/index.nvue:1064:30)
 at onScroll._cache.<computed>._cache.<computed> (/pages/birthday/index.nvue:1237:93)
13:12:24.827 [Vue warn]: Unhandled error during execution of native event handler
 at <FuiHorizontalScrollscroll=false>
 at <BirthdayIndex__pageId=4__pagePath="pages/birthday/index"__pageQuery={}>
13:12:24.827 [JS Framework] Failed to invoke the event handler of "scroll" on scroller (482):
 TypeError: Cannot read property 'ref' of undefined
13:12:24.845 [Vue warn]: Unhandled error during execution of native event handler
 at <FuiHorizontalScrollscroll=false>
 at <BirthdayIndex__pageId=4__pagePath="pages/birthday/index"__pageQuery={}>
13:12:24.845 [JS Framework] Failed to invoke the event handler of "scroll" on scroller (482):
 TypeError: Cannot read property 'ref' of undefined
13:12:24.857 [Vue warn]: Unhandled error during execution of native event handler
 at <FuiHorizontalScrollscroll=false>
 at <BirthdayIndex__pageId=4__pagePath="pages/birthday/index"__pageQuery={}>
13:12:24.860 [JS Framework] Failed to invoke the event handler of "scroll" on scroller (482):
 TypeError: Cannot read property 'ref' of undefined
13:12:24.874 [Vue warn]: Unhandled error during execution of native event handler
 at <FuiHorizontalScrollscroll=false>
 at <BirthdayIndex__pageId=4__pagePath="pages/birthday/index"__pageQuery={}>
13:12:24.877 [JS Framework] Failed to invoke the event handler of "scroll" on scroller (482):
 TypeError: Cannot read property 'ref' of undefined
13:12:24.892 [Vue warn]: Unhandled error during execution of native event handler
 at <FuiHorizontalScrollscroll=false>
 at <BirthdayIndex__pageId=4__pagePath="pages/birthday/index"__pageQuery={}>
13:12:24.892 [JS Framework] Failed to invoke the event handler of "scroll" on scroller (482):
 TypeError: Cannot read property 'ref' of undefined
13:12:24.908 [Vue warn]: Unhandled error during execution of native event handler
 at <FuiHorizontalScrollscroll=false>
 at <BirthdayIndex__pageId=4__pagePath="pages/birthday/index"__pageQuery={}>
13:12:24.908 [JS Framework] Failed to invoke the event handler of "scroll" on scroller (482):
 TypeError: Cannot read property 'ref' of undefined
13:12:24.923 [Vue warn]: Unhandled error during execution of native event handler
 at <FuiHorizontalScrollscroll=false>
 at <BirthdayIndex__pageId=4__pagePath="pages/birthday/index"__pageQuery={}>
13:12:24.923 [JS Framework] Failed to invoke the event handler of "scroll" on scroller (482):
 TypeError: Cannot read property 'ref' of undefined