<!DOCTYPE html>
<html>
<head>
<title>Untitled</title>
<meta charset="utf-8">
<style type="text/css">
</style>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.12.4/jquery.min.js"></script>
<script>
$(function() {
$('.moveout_go').on('click', function () {
//1 вариант $(this).nextAll('.moveout_body:first').slideToggle(200);
$(' ~ .moveout_body:first', this).slideToggle(200); //2 вариант
//3 вариант $('.moveout_body').eq($('.moveout_go').index(this)).slideToggle(200);
});
});
</script>
</head>
<body>
<ul>
<li><br>
<span class="moveout_go">123</span><br>
<div class="moveout_body">456</div>
<br>
<span class="moveout_go">123</span><br>
<div class="moveout_body">456</div>
<br>
<span class="moveout_go">123</span><br>
<div class="moveout_body">456</div>
</li>
</ul>
</body>
</html>