Павел Турченко,
<!DOCTYPE HTML>
<html>
<head>
<title>Untitled</title>
<meta charset="utf-8">
<style type="text/css">
</style>
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.11.0/jquery.min.js"></script>
<script>
$(function() {
$(".spinner").each(function(c, b) {
$(b).on("click", ".btn-default", function() {
var a = $(".form-control", b)[0];
$(".btn-default", b).index(this) ? a.value-- : a.value++;
0 > a.value && (a.value = 0)
})
})
});
</script>
</head>
<body>
<div class="input-group spinner">
<input type="text" class="form-control" value="1">
<div class="input-group-btn-vertical">
<button class="btn btn-default" type="button">+</button>
<button class="btn btn-default" type="button">–</button>
</div>
</div>
<div class="input-group spinner">
<input type="text" class="form-control" value="1">
<div class="input-group-btn-vertical">
<button class="btn btn-default" type="button">+</button>
<button class="btn btn-default" type="button">–</button>
</div>
</div>
</body>
</html>