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https://bbs.tsingfun.com/thread-1984-1-1.html 

AppInventor2如何实现播放视频并在上面显示两行文本字幕? - App应用开发 -...

...播放拓展实现:https://bbs.tsingfun.com/thread-1719-1-1.html 拓展始化在一个布局组件上,组件上可以添加文本。拓展本身也支持字幕功能。
https://bbs.tsingfun.com/thread-2128-1-1.html 

MQTT订阅一次收不到事件触发,多次订阅可以? - 用户反馈 - 清泛IT社区,为...

用户反馈,连接状态正常,在始化中订阅一次,收不到数据事件触发。 每次点击订阅一次,就能收到。这个需要深入测试一下。
https://bbs.tsingfun.com/thread-2206-1-1.html 

切换屏幕后如何自动恢复蓝牙连接 - App Inventor 2 中文网 - 清泛IT社区,为创新赋能!

...到微数据库,屏幕 2 拿出来,使用 connectwithaddress 方法在始化事件中重新连接一次。
https://bbs.tsingfun.com/thread-2268-1-1.html 

位置传感器经纬度为0的问题 - 用户反馈 - 清泛IT社区,为创新赋能!

...第二个屏幕 再返回第一个 就变0,0了 Pursuer丶: 一开始始化的时候传感器经纬度 没问题
https://www.tsingfun.com/it/te... 

再说WCF Data Contract KnownTypeAttribute - 更多技术 - 清泛网 - 专注IT技能提升

...来判断到底返回哪个子类。我们可以简单的写个客户端来调用一下这个服务,但很快你会发现浏览器(客户端)返回给你了错误: Server Error in '/' Application. The underlying connection was closed: The connection was closed unexpectedly. Descri...
https://www.tsingfun.com/it/te... 

再说WCF Data Contract KnownTypeAttribute - 更多技术 - 清泛网 - 专注IT技能提升

...来判断到底返回哪个子类。我们可以简单的写个客户端来调用一下这个服务,但很快你会发现浏览器(客户端)返回给你了错误: Server Error in '/' Application. The underlying connection was closed: The connection was closed unexpectedly. Descri...
https://www.tsingfun.com/it/te... 

再说WCF Data Contract KnownTypeAttribute - 更多技术 - 清泛网 - 专注IT技能提升

...来判断到底返回哪个子类。我们可以简单的写个客户端来调用一下这个服务,但很快你会发现浏览器(客户端)返回给你了错误: Server Error in '/' Application. The underlying connection was closed: The connection was closed unexpectedly. Descri...
https://www.tsingfun.com/it/te... 

再说WCF Data Contract KnownTypeAttribute - 更多技术 - 清泛网 - 专注IT技能提升

...来判断到底返回哪个子类。我们可以简单的写个客户端来调用一下这个服务,但很快你会发现浏览器(客户端)返回给你了错误: Server Error in '/' Application. The underlying connection was closed: The connection was closed unexpectedly. Descri...
https://www.tsingfun.com/it/te... 

再说WCF Data Contract KnownTypeAttribute - 更多技术 - 清泛网 - 专注IT技能提升

...来判断到底返回哪个子类。我们可以简单的写个客户端来调用一下这个服务,但很快你会发现浏览器(客户端)返回给你了错误: Server Error in '/' Application. The underlying connection was closed: The connection was closed unexpectedly. Descri...
https://www.tsingfun.com/it/te... 

再说WCF Data Contract KnownTypeAttribute - 更多技术 - 清泛网 - 专注IT技能提升

...来判断到底返回哪个子类。我们可以简单的写个客户端来调用一下这个服务,但很快你会发现浏览器(客户端)返回给你了错误: Server Error in '/' Application. The underlying connection was closed: The connection was closed unexpectedly. Descri...