更新

assets/css/joe.global.scss

@@ -278,11 +278,23 @@
                 left: 0;
                 width: 100%;
                 height: 273px;
-                background: url('https://cdn.jsdelivr.net/npm/typecho_joe_theme@4.3.5/assets/img/snow.gif') no-repeat;
+                background: url('https://cdn.jsdelivr.net/gh/HaoOuBa/Joe@master/assets/img/snow.gif') no-repeat;
                 background-size: cover;
                 z-index: 3;
                 pointer-events: none;
             }
+            &:hover::after {
+                display: block;
+            }
+            .image {
+                position: absolute;
+                top: 0;
+                left: 0;
+                width: 100%;
+                height: 120px;
+                object-fit: cover;
+                z-index: 1;
+            }
         }
     }
 }

functions.php

@@ -87,4 +87,16 @@ function themeConfig($form)
     );
     $JAside->setAttribute('class', 'joe_content joe_aside');
     $form->addInput($JAside->multiMode());
+
+    $JAside_Author_Image = new Typecho_Widget_Helper_Form_Element_Textarea(
+        'JAside_Author_Image',
+        NULL,
+        NULL,
+        '作者栏 —— 背景（非必填）',
+        '介绍：用于修改作者栏的背景图片 <br/>
+         格式：图片地址 <br />
+         注意：不填写时，则显示默认背景'
+    );
+    $JAside_Author_Image->setAttribute('class', 'joe_content joe_aside');
+    $form->addInput($JAside_Author_Image);
 } ?>

public/aside.php

@@ -2,7 +2,7 @@
     <aside class="joe_aside">
         <?php if (in_array('author', $this->options->JAside)) : ?>
             <section class="joe_aside__item author">
-                <img class="wallpaper" />
+                <img class="image" src="" alt="<?php $this->author->screenName(); ?>" />
             </section>
         <?php endif; ?>
     </aside>