案例：html5案例     状态：可编辑再运行    进入竖版
 运行结果　
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<!DOCTYPE html>
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<html>
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<body>
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​
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<p>计数: <output id="result"></output></p>
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<button onclick="startWorker()">开始 Worker</button>
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<button onclick="stopWorker()">停止 Worker</button>
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<br /><br />
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​
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<script>
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var w;
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​
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function startWorker()
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{
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if(typeof(Worker)!=="undefined")
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  {
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  if(typeof(w)=="undefined")
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  {
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  w=new Worker("/example/html5/demo_workers.js");
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  }
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  w.onmessage = function (event) {
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    document.getElementById("result").innerHTML=event.data;
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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 Web Workers...";
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  }
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}
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​
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function stopWorker()
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{
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w.terminate();
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}
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</script>
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​
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</body>
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</html>
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​