js简易数字微调调整示例

<style>
    .spinner{zoom:1;overflow:auto;border:solid 1px #ccc;float:left;}
    .spinner input{border:none;float:left;margin-top:5px}
    .spinner .arrow{float:right;font-size:12px;}
    .spinner .arrow a{display:block;width:20px;background:#eee;text-align:center;cursor:pointer;-moz-user-select:none;-webit--user-select:none;user-select:none}
</style><br />
<div class="spinner">
    <input type="text" readonly="readonly" value="1000" id="t1" />
    <div class="arrow"><a onclick="addminus('t1')">↑</a><a onclick="addminus('t1', true)">↓</a></div>
</div>
<div class="spinner">
    <input type="text" readonly="readonly" value="1000" id="t2" />
    <div class="arrow"><a onclick="addminus('t2')">↑</a><a onclick="addminus('t2', true)">↓</a></div>
</div>
<script>
    function addminus(id, add) {
        var t = document.getElementById(id), v = parseInt(t.value) || 0;
        add ? v++ : v--;
        t.value = v;
    }
</script>