?? JavaScript? ??? ???? "? ?? ???" ?????
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??? "? ?? ???" ?????? ???? ??? ???? ????? ?? ?? ? ??? ??????. jQuery? ?? JavaScript ?????? ??? ???? ????? ? ??? JavaScript?? ???? ?? ?? ? ???? ? ???? ??? ? ? ????.
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???? JavaScript ?? , scrollTo? ???? ?? ??? ??? ?? ???? ??? ?????? ??? ? ????. ? ?? ????? ?????:
- element: ?????? HTML ??(????? ?? ???? ?? document.body).
- : ??? ??? ??(?? ??).
- duration: ??? ??? ????? ?? ??(???? ?????? ?? 600ms? ??).
?? ??:
- if (duration <= 0) return: ????? ?? ??? 0?? ??? ??? ??? ?????.
- var Difference = to - element.scrollTop: ?? ??? ??? ?? ??? ??? ?????.
- var perTick = ?? / ?? * 10: ? ???? ???? ?? ?????.
- setTimeout(...): ??? ??(10ms)?? ????? ??? ???? ?? ??? ?????.
- element.scrollTop = element.scrollTop perTick: ??? perTick ??? ??? ??? ???????.
- ??? ??? ?? ??? ?? ??? ??? ??? ?????. ??? ??? ??? ?? ??? ?? ????? ?????.
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scrollTo ??? HTML? ?????.
<code class="html"><button id="scrollme" type="button">Go to Top</button><p>?? ??? ???? ??? ?????:</p>
<pre class="brush:php;toolbar:false"><code class="javascript">var scrollme = document.querySelector("#scrollme");
scrollme.addEventListener("click",runScroll,false);
function runScroll() {
scrollTo(document.body, 0, 600);
}</code>
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? ???? ??? ???? ???? ??? ??? ?????. ?? JavaScript? ???? ???? ??? ?????. ???? ??? ??? ??? ? ??????? ?????.
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