获取span的value值
$(\'.span-item\').on(\'click\',function(){
var _that = $(this);
_that.addClass(\'span-item-active\').siblings(\'span\').removeClass(\'span-item-active\');
alert($(this).attr("value"));
})
});
<div class="fl">
<span class="span-item span-item-active" value="30">30日</span>
<span class="span-item" value="60">60日</span>
<span class="span-item" value="90">90日</span>
</div>