Refs
- WSchools Web Workers
What and why
- Web workers enable web content to run scripts in background threads, without interfering with user interface.
- Web workers support: TODO
Example
Simple counter
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| simple-counter
- index.html
- demo-worker.js
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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>
<p><strong>Note:</strong> Internet Explorer 9 and earlier versions do not support Web Workers.</p>
<script>
var w;
function startWorker() {
if(typeof(w) == "undefined") {
w = new Worker("demo_workers.js");
}
w.onmessage = function(event) {
document.getElementById("result").innerHTML = event.data;
};
}
function stopWorker() {
w.terminate();
w = undefined;
}
</script>
</body>
</html>
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var i=0;
function timedCount() {
i=i+1;
postMessage(i);
setTimeout("timedCount()", 500);
}
timedCount();
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Use serve to host the page. Web worker does not work by just double click the index.html file.
