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我添加一個驗證碼的功能，我在前端頁面后，發現沒填寫驗證碼，為什么可以直接提交表單呢？

{php extract(dr_get_form_post_value('xunpan'))}
    <form action="{$post_url}&is_show_msg=1" class="form-horizontal" method="post" name="feedback" id="myform">
<ul>
<li><p>Name<span>*</span></p><input name="data[title]" type="text" placeholder="Name" required="required"></li>
<li><p>Country</p><input name="data[guojia]" type="text" placeholder="Country"></li>
<li><p>E-mail<span>*</span></p><input name="data[email]" type="text" placeholder="E-mail" required="required"></li>
<li><p>Tel</p><input name="data[dianhua]" type="text" placeholder="Tel"></li>
<li><p>Company</p><input name="data[gongsi]" type="text" placeholder="Company"></li>
<li><p>Message<span>*</span></p><textarea name="data[neirong]" placeholder="Message" required="required"></textarea></li>{if $is_post_code}
{dr_lang('驗證碼')}
<input type="text" name="code">
{dr_code(120, 66)}
{/if}
<li><button type="submit">Send Message</button></li>
</ul>
</form>