質問編集履歴
1
追記1を追加しました。
test
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test
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@@ -177,3 +177,161 @@
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ankerClickPageMove();
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```
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---
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## 追記1
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アドバイスを元に修正してみました。
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前より軽くなり、計測もできるようになりました。
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ただ、計測時は重くないブラウザが止まってしまいますが。。。
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```
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const ankerClickPageMove = () => {
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//定数
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const anker = document.querySelectorAll('a[href^="#"]:not([target="_blank"])'),
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ankerNum = anker.length,
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max = 50,
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interval = 10;
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//アニメーション
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function easeOut(p) {
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return p * (2 - p);
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};
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//位置取得
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function getTargetTop(elm) {
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const href = elm.getAttribute('href'),
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target = document.querySelector(href),
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info = target.getBoundingClientRect(),
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posY = info.top + window.pageYOffset;
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return posY;
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};
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//位置情報へ移動
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function setTargetMove(elm) {
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//変数
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let progress = 0,
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goal = 0,
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action = null;
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//定数
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const start = window.pageYOffset, //スタート位置
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move = function() {
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let pos = getTargetTop(elm), //最終位置
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diff = pos - start,
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upOrDown = diff <= 0;
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progress++;
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goal = start + (diff * easeOut(progress / max));
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window.scrollTo(0, goal);
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// 目的位置に到達したらSTOP
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if ((upOrDown && pos >= goal) || (!upOrDown && goal >= pos)) {
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clearInterval(action);
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progress = null;
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goal = null;
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action = null;
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}
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};
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action = setInterval(move, interval);
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};
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//クリックイベントをセットする
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function setClickEvent() {
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for(let i = 0; i < ankerNum; i++) {
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const _self = anker[i];
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_self.addEventListener('click', function(e) {
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e.preventDefault();
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setTargetMove(this);
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});
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}
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};
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setClickEvent();
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}
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```
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