Function isInViewPort

Pagetual/pagetual.user.js:11515–11532

(element)

    }

    function isInViewPort(element) {
        const viewWidth = window.innerWidth || document.documentElement.clientWidth;
        const viewHeight = window.innerHeight || document.documentElement.clientHeight;
        const {
            top,
            right,
            bottom,
            left
        } = element.getBoundingClientRect();

        return (
            top >= 0 &&
            left >= 0 &&
            right <= viewWidth + 1 &&
            top <= viewHeight * rate &&
            isVisible(element, _unsafeWindow)
        );
    }

    function getPageBar() {
        let preBar = null, nextBar = null;