点击aa,数字加一，点击bb,数字减一
<a href="#">-</a><input value="1" type="text" /><a href="#">+</a>

[解决办法]

HTML code

<a href="javascript:op(-1)">-</a><input value="1" type="text" id="txt" /><a href="javascript:op(1)">+</a><script type="text/javascript">    function op(unit) {        var txt = document.getElementById('txt'), v = txt.value;        txt.value = parseInt(v, 10) + unit;    }</script>
[解决办法]
JScript code
 <script src="http://code.jquery.com/jquery-latest.js"></script><script type="text/javascript">    function op(unit) { $("#txt").val(parseInt($("#txt").val())+unit);     }</script>