目录Shutdown方法RegisterOnShutdown方法sync.WaitGroup处理退出函数Shutdown方法 Go1.8之后有了Shutdown方法，用来优雅的关闭（Graceful Shutdown）服务。
SVG DOM can be controlled with JavaScript, so it开发者_StackOverflow can be AJAX-enabled... I wonder if there are some SVG components for Wicket yet. And if Wicket can have pure xml/svg as the output
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