常用后台登陆验证码刷新：
<li class="verify">
<label>验证码：</label>
<input class="input verifyfor" type="text" name="verify"><img src="{:captcha_uz()}">
</li>$(".verify img").on("click",function (){
var tath = $(this),data_src = "{:captcha_uz()}?";
tath.attr("src",data_src+ new Date().getTime());
});
