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<link rel="shortcut icon" width=32px> | |
<canvas style="display: none" id="loader" width="16" height="16"></canvas> | |
<script> | |
class Loader { | |
constructor(link, canvas) { | |
this.link = link; | |
this.canvas = canvas; | |
this.context = canvas.getContext('2d'); | |
this.context.lineWidth = 2; | |
this.context.strokeStyle = "white"; | |
} | |
setProgress(progress) { | |
const startAngle = 1.5 * Math.PI; | |
this.context.clearRect(0, 0, 16, 16); | |
this.context.beginPath(); | |
this.context.arc(8, 8, 5, startAngle, (progress * 2 * Math.PI) / 100 + startAngle); | |
this.context.stroke(); | |
this.link.href = this.canvas.toDataURL("image/png"); // update favicon | |
} | |
} | |
const canvas = document.querySelector("#loader"); | |
const link = document.querySelector('link[rel*="icon"]'); | |
const loader = new Loader(link, canvas); | |
let progress = 0; | |
const loading = () => { | |
loader.setProgress(progress); | |
if (progress >= 100) { | |
return; | |
} | |
progress++; | |
requestAnimationFrame(loading); | |
} | |
loading(); | |
</script> | |
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