//html頁面

<p class="fix">
     <label class="word word2"></label>
     <label class="sex current" data-value="1" onclick="current($(this))">男</label>
     <label class="sex" data-value="2"  onclick="current($(this))">女</label>
     <input type="hidden" name="sex" id="sex" value="1"/>
</p>
 

<pre name="code" class="html"> function current(obj){
        var a=obj.data('value');
        obj.addClass('current').siblings().removeClass('current');
        console.log(obj.siblings('input').val());
        obj.siblings('input').val(a);
    }