Created
July 20, 2018 05:14
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Javascript Timer using Web Worker (Async Function)
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| // index.html | |
| <p id="timer"> | |
| 00:00:00 | |
| </p> | |
| <button onClick="hangTheBrowser()"> | |
| Hang the browser | |
| </button> | |
| <p id="message">Your message here</p> | |
| /* ---- */ | |
| // script.js | |
| var worker = new Worker('worker.js'); | |
| worker.addEventListener('message', function(e) { | |
| $('#message').text(e.data); | |
| }); | |
| let count = 0; | |
| let rAF_ID; | |
| var rAFCallback = function(callback) { | |
| let count = callback; | |
| let ms = Math.floor(count % 1000); | |
| let s = Math.floor((count / 1000)) % 60; | |
| let m = Math.floor((count / 60000)) % 60; | |
| $('#timer').text(m + ":" + s + ":" + ms); | |
| rAF_ID = requestAnimationFrame( rAFCallback ); | |
| } | |
| // request animation frame on render | |
| rAF_ID = requestAnimationFrame( rAFCallback ); | |
| function hangTheBrowser() { | |
| worker.postMessage('hang the browser'); | |
| } | |
| /* ---- */ | |
| // worker.js | |
| self.addEventListener('message', function(e) { | |
| if(e.data === 'hang the browser') { | |
| let val = ""; | |
| for (let i = 0; i < 10000; i++) { | |
| for (let j = 0; j < 10000; j++) { | |
| val = "Worker returned: " + i + j; | |
| } | |
| } | |
| self.postMessage(val); | |
| } | |
| }); |
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