html5 web worker实现异步执行 计数器

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<!DOCTYPE html>
<html>
<body>
 
<p>Count numbers: <output id="result"></output></p>
<button onclick="startWorker()">Start Worker</button>
<button onclick="stopWorker()">Stop Worker</button>
<br /><br />
 
<script>
var w;
 
function startWorker()
{
if(typeof(Worker)!=="undefined")
{
  if(typeof(w)=="undefined")
    {
    w=new Worker("demo_workers.js");
    }
  w.onmessage = function (event) {
    document.getElementById("result").innerHTML=event.data;
  };
}
else
{
document.getElementById("result").innerHTML="Sorry, your browser
 does not support Web Workers...";
}
}
 
function stopWorker()
{
w.terminate();
}
</script>
 
</body>
</html>