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23 lines
686 B
JavaScript
23 lines
686 B
JavaScript
export default {
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methods: {
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// http://stackoverflow.com/a/24559613
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scrollToTop(scrollDuration = 300) {
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let cosParameter = window.scrollY / 2;
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let scrollCount = 0;
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let oldTimestamp = performance.now();
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function step(newTimestamp) {
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scrollCount += Math.PI / (scrollDuration / (newTimestamp - oldTimestamp));
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if(scrollCount >= Math.PI) window.scrollTo(0, 0);
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if(window.scrollY === 0) return;
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window.scrollTo(0, Math.round(cosParameter + cosParameter * Math.cos(scrollCount)));
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oldTimestamp = newTimestamp;
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window.requestAnimationFrame(step);
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}
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window.requestAnimationFrame(step);
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}
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}
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} |