vue this.$refs为空

vue this.$refs为空    npm list vue为空    vue this.$refs undefined    vue3 $refs获取不到    this.$refs.form.validate    this.$refs[formname].validate    ${pagecontext.request.contextpath}    this.$refs.paging.complete    "this.$refs[\"form\"].validate"    this.$refs.popup.open is not a function    this.$refs.form.validate()    vue this.$router.replace    vue this.$store.dispatch    vue3 this.$set is not a function    this.$refs.upload.submit()    vue document waiting for server response    vue2 vue.config.js    vue3 this.$refs    一个vue调用另一个vue的变量    "