我實現了我在網上找到的這段代碼,並添加了一個if語句,用於檢查元素之前是否已經過動畫。如果有,它應該刪除使其成爲動畫目標的類。出於某種原因,它不起作用,並且元素每當它進入視口時都會生成動畫,而不僅僅是第一次像我希望的那樣。jQuery - 在滾動bug上動畫
var $flyInLeft = $('.fly-in-left');
var $window = $(window);
function check_if_in_view() {
var window_height = $window.height();
var window_top_position = $window.scrollTop();
var window_bottom_position = (window_top_position + window_height);
$.each($flyInLeft, function() {
var $element = $(this);
var element_height = $element.outerHeight();
var element_top_position = $element.offset().top;
var element_bottom_position = (element_top_position + element_height);
//check to see if this current container is within viewport
if ((element_bottom_position >= window_top_position) &&
(element_top_position <= window_bottom_position)) {
$element.addClass('animated slideInLeft already-viewed');
} else {
$element.removeClass('animated slideInLeft');
}
// This is the bit that doesn't seem to work.
if ($element.hasClass('already-viewed')) {
$element.removeClass('fly-in-left');
}
});