animação js html

function ik_enableScrollAnimations(t) {
t
= t || window, $(t).on("scroll", $(function() {
$
(".animate").each(function() {
if ($(this).data("scrollAnimation") !== !1) {
var e = $(this).closest(".container").parent();
e
.length || (e = $(this).parent());
var n = $(t).height(),
i
= $(t).scrollTop(),
r
= 0;
e
.data("animate-offset") && (r = e.data("animate-offset"));
var o = e.offset().top;
"string" == typeof t && (o += i), i + n >= o + r && $(this).addClass("in")
}
})
}, 0)), $(window).load(function() {
$
(t).trigger("scroll")
})
}