爵士樂即興錄音/傑夫‧高布倫

descSectionTop) { desc_sections.find("ul").css({"top": 0}); if (currentScrollPos > prevScrollPos && product_window.scrollTop() > descSectionTop + headerHeight) { desc_sections .stop() .addClass("desc_sections_hold") .css({"min-height": descSectionHeight}) .find("ul") .css({"top": 0}); } else if (prevScrollPos > currentScrollPos) { desc_sections .stop() .addClass("desc_sections_hold") .css({"min-height": descSectionHeight}) .find("ul") .css({"top": headerHeight}); } else { prevScrollPos = 0; } prevScrollPos = currentScrollPos; if ($(window).width() < 768) { $("body").css("padding-bottom", "68px"); } } else { prevScrollPos = 0; desc_sections.stop().removeClass("desc_sections_hold") if ($(window).width() < 768) { $("body").css("padding-bottom", "68px"); } } // 點選產品說明滑動 $(".desc_sections a.scroll").bind("click", function(event) { var targetScrollTop = parseInt($($(this).attr("href")).offset().top - descSectionHeight + 1); if (targetScrollTop > window.scrollY + 1) { $("html, body").stop().animate({ scrollTop: targetScrollTop }, 300); } else { $("html, body").stop().animate({ scrollTop: targetScrollTop - headerHeight }, 300); } }); // 顯示當前產品說明 if (currentScrollPos > prevScrollInformationPos) { $.each(desc_section_list, function(index, desc_section) { var desc_sectionTop = $(desc_section).offset().top - descSectionHeight - 1 var desc_sectionHeight = $(desc_section).height() var current_desc_section = $("a.scroll[href$='" + $(desc_section).attr("id") + "']"); if (product_window.scrollTop() > desc_sectionTop || index === 0) { current_desc_section .stop() .addClass('active') .parent() .siblings() .find("a") .removeClass('active'); } else { current_desc_section.removeClass('active'); } prevScrollInformationPos = currentScrollPos; }); } else { $.each(desc_section_list, function(index, desc_section) { var desc_sectionTop = $(desc_section).offset().top - descSectionHeight - 1 var desc_sectionHeight = $(desc_section).height() var current_desc_section = $("a.scroll[href$='" + $(desc_section).attr("id") + "']"); if (product_window.scrollTop() + headerHeight > desc_sectionTop) { current_desc_section .stop() .addClass('active') .parent() .siblings() .find("a") .removeClass('active'); } else { current_desc_section.removeClass('active'); } }); prevScrollInformationPos = currentScrollPos; } }); })