大家好，麻煩大佬們看下下面這段代碼是否有問題，點擊向郵箱發送驗證碼的時候沒反應，麻煩你們指導一下，謝謝！

<div class="yzm-form">

<form action="" method="post" onsubmit="return checkall(this)')">

<ul>  

<li><input type="text" class="input"  name="email" id="email" placeholder="請輸入電子郵箱" value=""></li>

<li><input type="text" class="input code"  name="email_code" id="email_code" placeholder="郵箱收到的驗證碼" style="width:181px;"><a class="btn_valid"  onclick="send_code()" style="width:145px;text-align: center;"><span id="send_code">向郵箱發送驗證碼</span><span id="send_show" style="display:none;">重新發送(60s)</span></a></li>

<li><input type="submit" class="submit" name="dosubmit" value="注 冊"></li>

<li class="last_li"><input type="checkbox" value="1" id="agree" name="agree"/> 我已閱讀并同意<a onclick="show_protocol()" href="javascript:void(0);">《用戶注冊協議》</a></li>

</ul>

<div class="yzmcms_bottom">已有賬號？<a href="{U('login')}">點擊登錄</a>&nbsp;&nbsp;&nbsp; <a href={U('member/reset/init')}" target="_blank" style="color:#959595;float: right">忘記密碼？</a></div>

</form>

</div>