发现<div id=tab2_login" 并将其替换为以下代码。假设你会改变CSS 和JS 照着

 <div id="tab2_login" class="tab_content_login" style="display:none;">
        <h3>Register for this site!</h3>
        <p>Sign up now for the good stuff.</p>
        <form method="post" action="<?php echo site_url(\'wp-login.php?action=register\', \'login_post\') ?>" class="wp-user-form">
            <div class="username">
                <label for="user_login"><?php _e(\'Username\'); ?>: </label>
                <input type="text" name="user_login" value="<?php echo esc_attr(stripslashes($user_login)); ?>" size="20" id="user_login" tabindex="101" />
            </div>
            <div class="password">
                <label for="user_email"><?php _e(\'Your Email\'); ?>: </label>
                <input type="text" name="user_email" value="<?php echo esc_attr(stripslashes($user_email)); ?>" size="25" id="user_email" tabindex="102" />
            </div><!--New Field Here -->
            <div class="username">
                <label for="user_login"><?php _e(\'New Field Name\'); ?>: </label>
                <input type="text" name="new_field" value="<?php echo esc_attr(stripslashes($new_field)); ?>" size="20" id="new_field" tabindex="103" />
            </div> <!--End of New Field -->
            <div class="login_fields">
                <?php do_action(\'register_form\'); ?>
                <input type="submit" name="user-submit" value="<?php _e(\'Sign up!\'); ?>" class="user-submit" tabindex="103" />
                <?php $register = $_GET[\'register\']; if($register == true) { echo \'<p>Check your email for the password!</p>\'; } ?>
                <input type="hidden" name="redirect_to" value="<?php echo $_SERVER[\'REQUEST_URI\']; ?>?register=true" />
                <input type="hidden" name="user-cookie" value="1" />
            </div>
        </form>
    </div>