内容介绍
jquery小火箭返回顶部特效代码,效果非常不错。
js核心代码:
$(function() {
var e = $("#rocket-to-top"),
t = $(document).scrollTop(),
n,
r,
i = !0;
$(window).scroll(function() {
var t = $(document).scrollTop();
t == 0 ? e.css("background-position") == "0px 0px" ? e.fadeOut("slow") : i && (i = !1, $(".level-2").css("opacity", 1), e.delay(100).animate({
marginTop: "-1000px"
},
"normal",
function() {
e.css({
"margin-top": "-125px",
display: "none"
}),
i = !0
})) : e.fadeIn("slow")
}),
e.hover(function() {
$(".level-2").stop(!0).animate({
opacity: 1
})
},
function() {
$(".level-2").stop(!0).animate({
opacity: 0
})
}),
$(".level-3").click(function() {
function t() {
var t = e.css("background-position");
if (e.css("display") == "none" || i == 0) {
clearInterval(n),
e.css("background-position", "0px 0px");
return
}
switch (t){
case "0px 0px":
e.css("background-position", "-298px 0px");
break;
case "-298px 0px":
e.css("background-position", "-447px 0px");
break;
case "-447px 0px":
e.css("background-position", "-596px 0px");
break;
case "-596px 0px":
e.css("background-position", "-745px 0px");
break;
case "-745px 0px":
e.css("background-position", "-298px 0px");
}
}
if (!i) return;
n = setInterval(t, 50),
$("html,body").animate({scrollTop: 0},"slow");
});
});