53 lines
1.4 KiB
JavaScript
53 lines
1.4 KiB
JavaScript
/* global KEEP */
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KEEP.initBack2Top = () => {
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KEEP.utils = {
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...KEEP.utils,
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back2BottomButton_dom: document.querySelector('.tool-scroll-to-bottom'),
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back2top() {
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const scrollTopTimer = setInterval(function () {
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let top = document.body.scrollTop || document.documentElement.scrollTop
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let speed = top / 2
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if (document.body.scrollTop !== 0) {
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document.body.scrollTop -= speed
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} else {
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document.documentElement.scrollTop -= speed
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}
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if (top === 0) {
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clearInterval(scrollTopTimer)
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}
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}, 50)
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},
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back2Bottom() {
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let scrollHeight = document.body.scrollHeight || document.documentElement.scrollHeight
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let scrollTop = document.body.scrollTop || document.documentElement.scrollTop
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const scrollBottomTimer = setInterval(function () {
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if (!scrollTop) scrollTop = 10
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scrollTop = Math.floor(scrollTop + scrollTop / 2)
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window.scrollTo(0, scrollTop)
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if (scrollTop >= scrollHeight) {
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clearInterval(scrollBottomTimer)
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}
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}, 50)
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},
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initBack2Top() {
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this.back2TopButton_dom.addEventListener('click', () => {
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this.back2top()
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})
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},
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initBack2Bottom() {
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this.back2BottomButton_dom.addEventListener('click', () => {
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this.back2Bottom()
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})
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}
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}
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KEEP.utils.initBack2Top()
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KEEP.utils.initBack2Bottom()
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}
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