案例：html5案例     状态：可编辑再运行    进入竖版
 运行结果　
​x
 
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<!DOCTYPE html>
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<html>
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<body>
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<h1>获得服务器更新</h1>
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<div id="result"></div>
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​
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<script>
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if(typeof(EventSource)!=="undefined")
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  {
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  var source=new EventSource("/example/html5/demo_sse.aspx");
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  source.onmessage=function(event)
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    {
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    document.getElementById("result").innerHTML+=event.data + "<br />";
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    };
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  }
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else
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  {
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  document.getElementById("result").innerHTML="Sorry, your browser does not support server-sent events...";
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  }
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</script>
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​
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</body>
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</html>