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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 | let scrollBarWidth; export default function () { if (scrollBarWidth !== undefined) { return scrollBarWidth; } const outer = document.createElement('div'); outer.className = 'f-scroll-view__wrap'; outer.style.visibility = 'hidden'; outer.style.width = '100px'; outer.style.position = 'absolute'; outer.style.top = '-9999px'; document.body.appendChild(outer); const widthNoScroll = outer.offsetWidth; outer.style.overflow = 'scroll'; const inner = document.createElement('div'); inner.style.width = '100%'; outer.appendChild(inner); const widthWithScroll = inner.offsetWidth; outer.parentNode.removeChild(outer); scrollBarWidth = widthNoScroll - widthWithScroll; return scrollBarWidth; } |