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var i=0;
function timedCount()
{
i=i+1;
postMessage(i); //posts a message back to the HTML page.
setTimeout("timedCount()",500);
}
timedCount();
<!-- When executing scripts in an HTML page, the page becomes unresponsive until the script is finished. -->
<!-- A web worker is a JavaScript that runs in the background, independently of other scripts, without affecting -->
<!-- the performance of the page. You can continue to do whatever you want: clicking, selecting things, etc., -->
<!-- while the web worker runs in the background. -->
<!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") //check whether the user's browser supports it
{
w=new Worker("demo_workers.js"); //creates a new web worker object and runs the code in "demo_workers.js"
//Add an "onmessage" event listener to the web worker
//When the web worker posts a message, the code within the event listener is executed. The data from the web worker
//is stored in event.data.
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(); //terminate a web worker, and free browser/computer resources
}
</script>
</body>
</html>
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