小编kla*_*isz的帖子

我怎样才能更有效地写这个？

HTML

<div class="navigation-left">left</div>
<div class="navigation-right">right</div>

JS

$(document).ready(function(){
    var offs = 0,
        speed = 700;

    $('.navigation-left').animate({
        left: offs,
        opacity: 0
    }, speed)
    .animate({
        left: 70 + offs,
        opacity: 100
    }, speed)
    .animate({
        left: offs,
        opacity: 0
    }, speed)
    .animate({
        left: 70 + offs,
        opacity: 100
    }, speed)
    .animate({
        left: offs,
        opacity: 0
    }, speed)
    .animate({
        left: 70 + offs,
        opacity: 100
    }, speed)
    .animate({
        left: offs,
        opacity: 100
    }, speed);

    $('.navigation-right').animate({
        right: offs,
        opacity: 0
    }, speed)
    .animate({
        right: 70 …