<!DOCTYPE html>
<html>
<body>
<p>计数： <output id="result"></output></p>
<button onclick="startWorker()">开始工作</button>
<button onclick="stopWorker()">停止工作</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="抱歉，你的浏览器不支持 Web Workers...";
}
}
function stopWorker()
{
w.terminate();
}
</script>
</body>
</html>
webworkers类似windowservice在后台跑任务
原文：http://www.cnblogs.com/csharphuang/p/4244887.html