大家好，麻烦大佬们看下下面这段代码是否有问题，点击向邮箱发送验证码的时候没反应，麻烦你们指导一下，谢谢！
<div class="yzm-form">
<form action="" method="post" onsubmit="return checkall(this)')">
<ul>
<li><input type="text" class="input" name="email" id="email" placeholder="请输入电子邮箱" value=""></li>
<li><input type="text" class="input code" name="email_code" id="email_code" placeholder="邮箱收到的验证码" style="width:181px;"><a class="btn_valid" onclick="send_code()" style="width:145px;text-align: center;"><span id="send_code">向邮箱发送验证码</span><span id="send_show" style="display:none;">重新发送(60s)</span></a></li>
<li><input type="submit" class="submit" name="dosubmit" value="注 册"></li>
<li class="last_li"><input type="checkbox" value="1" id="agree" name="agree"/> 我已阅读并同意<a onclick="show_protocol()" href="javascript:void(0);">《用户注册协议》</a></li>
</ul>
<div class="yzmcms_bottom">已有账号？<a href="{U('login')}">点击登录</a> <a href={U('member/reset/init')}" target="_blank" style="color:#959595;float: right">忘记密码？</a></div>
</form>
</div>
