wangjian

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Describe what this PR does / why we need it fix #789 Unified dubbo version management 为什么spring-cloud-alibaba里要单独管理dubbo版本,而不在spring-cloud-alibaba-dependencies里统一管理? 我们应该统一在alibaba-dependencies模块中做统一管理 Does this pull request fix one issue? 是的 Fixes #789 Describe how...

![image](https://user-images.githubusercontent.com/31959364/102971852-143c2000-4535-11eb-8d56-d8aa191f1095.png) joinChatRoom事件没有对应处理,导致页面一直转圈,无法继续 ![image](https://user-images.githubusercontent.com/31959364/102971934-3e8ddd80-4535-11eb-989f-58a5bfaecbc0.png)