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webworkers类似windowservice在后台跑任务

<!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