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什麼是 Web Worker？當在 HTML 頁面中執行指令碼時，頁面的狀態是不可響應的，直到指令碼已完成。
web worker 是運行在背景 JavaScript，獨立於其他指令碼，不會影響頁面的效能。您可以繼續做任何願意做的事情：點擊、選取內容等等，而此時 web worker 在後台運行。
檢測瀏覽器是否支援 Web Worker在建立 web worker 之前，請檢測使用者的瀏覽器是否支援它：
if(typeof(Worker)!=="undefined")
<!DOCTYPE html><html><head> <meta charset="utf-8"> <title>菜鳥教程(runoob.com)</title> </head><body><p>計數： <output id="result"></output></p><button onclick="startWorker()">開始工作</button> <button onclick="stopWorker()">停止工作</button><p><strong>注意：</strong> Internet Explorer 9 及更早 IE 版本瀏覽器不支援 Web Workers.</p><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，你的瀏覽器不支援 Web Workers..."; }}function stopWorker() { w.terminate(); w = undefined;}</script></body></html>
Web Worker 案例
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