text 元素在视口中

Posted 2021-05-03

(function ($) {
        $.fn.isInViewport = function () {
            var elementTop = $(this).offset().top;
            var elementBottom = elementTop + $(this).outerHeight();
            var viewportTop = $(window).scrollTop();
            var viewportBottom = viewportTop + $(window).height();
            return elementBottom > viewportTop && elementTop < viewportBottom;
        };
    }(jQuery));