Function startAutoScroll

Pagetual/pagetual.user.js:9478–9523

()

    }

    function startAutoScroll() {
        clearInterval(autoScrollInterval);
        if (autoScroll <= 0) return;
        let scrollRange_o = 1;
        if (autoScroll > 1000) {
            scrollRange_o = parseInt(autoScroll / 1000);
        }
        let devicePixelRatio = window.devicePixelRatio;
        let scrollRange = Math.ceil(scrollRange_o / devicePixelRatio);

        let scrollTarget, body = getBody(document);
        let checkOverflow = ele => {
            return ele.scrollHeight !== ele.clientHeight && getComputedStyle(ele).overflowY !== "hidden";
        };
        if (document.documentElement.scrollTop || checkOverflow(document.documentElement)) {
            scrollTarget = document.documentElement;
        } else if (body.scrollTop || checkOverflow(body)) {
            scrollTarget = body;
        } else {
            let tempEle;
            let img = body.querySelector('img');
            if (img) {
                tempEle = img;
                while (tempEle && !checkOverflow(tempEle)) {
                    tempEle = tempEle.parentNode;
                }
            }
            if (!tempEle && document.activeElement) {
                let tempEle = document.activeElement;
                while (tempEle && !checkOverflow(tempEle)) {
                    tempEle = tempEle.parentNode;
                }
            }
            if (tempEle) scrollTarget = tempEle;
        }
        scrollTarget = scrollTarget || document.documentElement;

        autoScrollInterval = setInterval(() => {
            if (isPause && !urlChanging) return;
            if (devicePixelRatio !== window.devicePixelRatio) {
                devicePixelRatio = window.devicePixelRatio;
                scrollRange = Math.ceil(scrollRange_o / devicePixelRatio);
            }
            scrollTarget.scrollTop += scrollRange;
        }, parseInt(1000 / autoScroll));
    }

    var inUpdate = false;
    var importHandler, configCon;