<in name=‘_SERVER["SERVER_NAME"]‘ value=‘ ‘>
<li>
<input type="text" name="address" class="register-input" placeholder="1">
</li>
<else/>
<li>
<input type="text" name="referrer" class="register-input" placeholder="2">
</li>
</in>
原文：https://www.cnblogs.com/luosong3/p/10688749.html