diff --git a/index.html b/index.html
index 03d2841..23fc47c 100644
--- a/index.html
+++ b/index.html
@@ -401,7 +401,7 @@
           <p class="component-description">用于内容分组和导航，支持描述文本和自定义高亮颜色。</p>
 
           <div class="component-demo">
-            <ui-tab id="demoTab" list="基本信息>个人资料|安全设置>账户安全|通知>消息提醒"></ui-tab>
+            <ui-tab id="demoTab" list="基本>个人资料|通知>消息提醒"></ui-tab>
             <div id="tabContent" style="padding: 15px; text-align: center"> 选项卡内容区域 </div>
           </div>
 
@@ -522,7 +522,7 @@
 
         // 选项卡切换事件
         document.getElementById('demoTab').addEventListener('change', function (e) {
-          document.getElementById('tabContent').innerText = `切换到: ${e.detail.innerText}`
+          document.getElementById('tabContent').innerText = e.detail.innerText
         })
 
         // 搜索框事件
diff --git a/index.js b/index.js
index f261657..0eb9dd8 100644
--- a/index.js
+++ b/index.js
@@ -424,9 +424,9 @@ class UI {
             this.ele.querySelector('.select-button').removeAttribute('disabled')
           }
         } else if (name == 'value') {
-          this.dl.innerHTML = ''
+          if (this.dl) this.dl.innerHTML = ''
           this.addOption()
-          this.button.innerText = this.placeholder || this.options[this.current].text
+          if (this.button) this.button.innerText = this.placeholder || this.options[this.current].text
         }
       }
       // 重置
@@ -446,7 +446,7 @@ class UI {
         const options = list.split(',')
         const optionValues = value.split(',')
 
-        this.dl.innerHTML = ''
+        if (this.dl) this.dl.innerHTML = ''
 
         // 添加选项
         options.forEach((item, index) => {
@@ -458,7 +458,7 @@ class UI {
             dd.classList.add('selected')
           }
           this.options.push({ text: item, value: optionValues[index] })
-          this.dl.appendChild(dd)
+          if (this.dl) this.dl.appendChild(dd)
         })
       }
       // 初始化
@@ -928,10 +928,12 @@ class UI {
         })
       }
     }
-    // TODO：对话框
+    // 对话框
     this.Dialog = class Dialog extends HTMLElement {
       // 可用属性
-      static observedAttributes = ['subtitle', 'content', 'hidden']
+      static get observedAttributes() {
+        return ['subtitle', 'content', 'hidden']
+      }
       constructor() {
         super()
         this.dialog = null
@@ -1016,7 +1018,7 @@ class UI {
                 --btn-background-color: linear-gradient(to bottom, #7983ff, #3297f3);
             }
             .dialog-mask {
-                position: absolute;
+                position: fixed;
                 width: 100%;
                 height: 100%;
                 background-color: var(--mask-color);
@@ -1103,10 +1105,12 @@ class UI {
         Object.assign(this, options)
       }
     }
-    // TODO：模态框
+    // 模态框
     this.Modal = class Modal extends HTMLElement {
       // 可用属性
-      static observedAttributes = ['subtitle', 'content', 'hidden']
+      static get observedAttributes() {
+        return ['subtitle', 'content', 'hidden']
+      }
       constructor() {
         super()
         // 模态框
@@ -1116,7 +1120,7 @@ class UI {
         // 标题
         this.subtitle = '标题'
         // 内容
-        this.content = '第一行<br/><br/>第二行<br/><br/>第三行<br/><br/>第四行'
+        this.content = '内容'
         // 动画定时器
         this.timer = null
         // 是否隐藏
@@ -1251,7 +1255,9 @@ class UI {
     // TODO：选项卡
     this.Tab = class Tab extends HTMLElement {
       // 可用属性
-      static observedAttributes = ['list', 'current']
+      static get observedAttributes() {
+        return ['list', 'current']
+      }
       constructor() {
         super()
         // 选项卡
@@ -1296,7 +1302,7 @@ class UI {
                 --text-color: black;
                 --background-color: transparent;
                 --description-color: #424242;
-                --gap: 5em;
+                --gap: 1em;
             }
             .tab-list {
               width: 100%;