diff --git a/Readme.md b/Readme.md
index 67c5b45..bc23dcd 100644
--- a/Readme.md
+++ b/Readme.md
@@ -30,7 +30,7 @@
 - [x] `wc-passwd`表单组件-文本输入框
 - [x] `wc-textarea`表单组件-多行文本输入框
 - [x] `wc-number`表单组件-步进数字输入
-- [ ] `wc-star`表单组件-评分
+- [x] `wc-star`表单组件-评分
 - [x] `wc-radio`表单组件-单选框
 - [ ] `wc-select`表单组件-下拉选择
 - [ ] `wc-cascadar`表单组件-多级联动
diff --git a/src/form/button.js b/src/form/button.js
index e2dd437..89f5b2d 100644
--- a/src/form/button.js
+++ b/src/form/button.js
@@ -111,11 +111,6 @@ class Button extends Component {
           w: 192px,
           h: 52px,
           f: 16px
-        ),
-        xxxxl: (
-          w: 212px,
-          h: 64px,
-          f: 18px
         )
       );
 
diff --git a/src/form/star.js b/src/form/star.js
new file mode 100644
index 0000000..725e195
--- /dev/null
+++ b/src/form/star.js
@@ -0,0 +1,208 @@
+/**
+ * {}
+ * @author yutent<yutent.io@gmail.com>
+ * @date 2023/03/21 16:14:10
+ */
+
+import { nextTick, css, html, Component, classMap } from '@bd/core'
+import '../icon/index.js'
+
+class Star extends Component {
+  static props = {
+    value: 0,
+    text: [],
+    'allow-half': false,
+    'show-value': false,
+    disabled: false,
+    clearable: false
+  }
+
+  static styles = [
+    css`
+      :host {
+        display: flex;
+        font-size: 14px;
+        --size: 32px;
+        cursor: pointer;
+        user-select: none;
+      }
+      label {
+        display: flex;
+        align-items: center;
+        line-height: 1;
+        cursor: inherit;
+
+        wc-icon {
+          margin: 0 3px;
+          transition: transform 0.15s linear, color 0.15s linear;
+
+          &[name='star'] {
+            color: var(--color-plain-3);
+          }
+
+          @for $i from 1 through 5 {
+            &:nth-child(#{$i}) {
+              &[name='star-full'],
+              &[name='star-half'] {
+                color: var(--star-active-#{$i}, var(--color-teal-1));
+              }
+            }
+          }
+          &:hover {
+            transform: scale(1.05);
+          }
+        }
+
+        span {
+          padding: 2px 8px 0;
+          margin: 0 6px;
+          color: var(--color-dark-1);
+        }
+      }
+    `,
+    // 尺寸
+    css`
+      @use 'sass:map';
+      $sizes: (
+        s: (
+          w: 52px,
+          h: 20px,
+          f: 12px
+        ),
+        m: (
+          w: 72px,
+          h: 24px,
+          f: 12px
+        ),
+        l: (
+          w: 108px,
+          h: 32px,
+          f: 14px
+        )
+      );
+
+      @loop $s, $v in $sizes {
+        :host([size='#{$s}']) {
+          --size: #{map.get($v, 'h')};
+          font-size: map.get($v, 'f');
+        }
+      }
+    `
+  ]
+
+  #width = 32
+  #value = { i: 0, f: 0 }
+  #stars = []
+
+  /**
+   * 更新图标渲染
+   * i: int
+   * f: float
+   */
+  #updateDraw(i, f = 0) {
+    let lastOne = 'star-half'
+    let value = this.value
+    let tmp = this.#value
+
+    if (i === -1) {
+      i = Math.floor(value)
+      f = +(value % 1).toFixed(1)
+      if (i > 0 && i === value) {
+        i--
+        f = 1
+      }
+    } else {
+      f = f < 0.5 ? 0.5 : 1
+    }
+
+    if (!this['allow-half']) {
+      f = f > 0 ? 1 : 0
+    }
+    // 数值没变化, 直接终止
+    if (i === tmp.i && f === tmp.f) {
+      return
+    }
+
+    if (f > 0.5) {
+      lastOne = 'star-full'
+    }
+
+    this.#stars.forEach((it, k) => {
+      it.name = k < i ? 'star-full' : 'star'
+    })
+
+    if (f > 0) {
+      this.#stars[i].name = lastOne
+    }
+
+    // 缓存结果
+    this.#value = { i, f }
+  }
+
+  handleMove(ev) {
+    if (this.disabled) {
+      return
+    }
+
+    if (ev.target.tagName === 'WC-ICON') {
+      let idx = +ev.target.dataset.idx
+      this.#updateDraw(idx, +(ev.offsetX / this.#width).toFixed(1))
+    }
+  }
+
+  handleLeave() {
+    if (this.disabled) {
+      return
+    }
+    this.#updateDraw(-1)
+  }
+
+  handleClick(ev) {
+    let tmp = this.#value
+    if (this.disabled) {
+      return
+    }
+    if (ev.target.tagName === 'WC-ICON') {
+      if (this.clearable && this.value === tmp.i + tmp.f) {
+        tmp.i = 0
+        tmp.f = 0
+        this.value = 0
+        this.#stars.forEach(it => ((it.name = 'star'), (it.style.color = '')))
+      } else {
+        this.value = tmp.i + tmp.f
+      }
+      this.$emit('change', { value: this.value })
+    }
+  }
+
+  mounted() {
+    this.#stars = [...this.$refs.box.children]
+    this.#width = this.#stars[0].clientWidth
+  }
+
+  render() {
+    let val = this.value
+    if (this.text.length === 5) {
+      val = this.text[Math.ceil(val) - 1]
+    } else {
+      val = val || ''
+    }
+    return html`
+      <label
+        ref="box"
+        @mousemove=${this.handleMove}
+        @mouseleave=${this.handleLeave}
+        @click=${this.handleClick}
+      >
+        <wc-icon data-idx="0" name="star"></wc-icon>
+        <wc-icon data-idx="1" name="star"></wc-icon>
+        <wc-icon data-idx="2" name="star"></wc-icon>
+        <wc-icon data-idx="3" name="star"></wc-icon>
+        <wc-icon data-idx="4" name="star"></wc-icon>
+        <span class="text">${this['show-value'] ? val : ''}</span>
+      </label>
+    `
+  }
+}
+
+Star.reg('star')
diff --git a/src/icon/index.js b/src/icon/index.js
index c7df197..f4d5e52 100644
--- a/src/icon/index.js
+++ b/src/icon/index.js
@@ -57,8 +57,7 @@ class Icon extends Component {
       'l': 32px,
       'xl': 36px,
       'xxl': 44px,
-      'xxxl': 52px,
-      'xxxxl': 64px
+      'xxxl': 52px
     );
 
     @loop $k, $v in $gaps {
diff --git a/src/layer/index.js b/src/layer/index.js
new file mode 100644
index 0000000..5a911cf
--- /dev/null
+++ b/src/layer/index.js
@@ -0,0 +1,453 @@
+/**
+ * {弹窗组件}
+ * @author yutent<yutent.io@gmail.com>
+ * @date 2023/03/06 15:17:25
+ */
+
+import { css, html, Component, nextTick, styleMap } from '@bd/core'
+import '../form/input.js'
+import Drag from '../drag/core.js'
+
+let uniqueInstance = null // 缓存当前打开的alert/confirm/prompt类型的弹窗
+let toastInstance = null // 缓存toast的实例
+
+const LANG_TITLE = '提示'
+const LANG_BTNS = ['取消', '确定']
+// 要保证弹层唯一的类型
+const UNIQUE_TYPES = ['alert', 'confirm', 'prompt']
+
+class Layer extends Component {
+  static props = {
+    type: '',
+    mask: false,
+    title: { type: String, default: LANG_TITLE, attribute: false },
+    content: { type: String, default: '', attribute: false },
+    btns: ['取消', '确定']
+  }
+
+  static styles = [
+    css`
+      :host {
+        display: none;
+        justify-content: center;
+        align-items: center;
+        position: fixed;
+        z-index: 65534;
+        left: 0;
+        top: 0;
+        width: 100%;
+      }
+      :host([type]) {
+        display: flex;
+      }
+      .noselect {
+        -webkit-touch-callout: none;
+        user-select: none;
+        img,
+        a {
+          -webkit-user-drag: none;
+        }
+      }
+    `,
+
+    css`
+      .layer {
+        overflow: hidden;
+        flex: 0 auto;
+        position: absolute;
+        z-index: 65535;
+        border-radius: 3px;
+        color: #666;
+        font-size: 14px;
+        background: rgba(255, 255, 255, 0.8);
+        box-shadow: 0 5px 20px rgba(0, 0, 0, 0.3);
+        transition: opacity 0.2s ease-in-out, left 0.2s ease-in-out,
+          right 0.2s ease-in-out, top 0.2s ease-in-out, bottom 0.2s ease-in-out;
+
+        &.scale {
+          transform: scale(1.01);
+          transition: transform 0.1s linear;
+        }
+        &.blur {
+          backdrop-filter: blur(5px);
+        }
+
+        &:active {
+          z-index: 65536;
+        }
+      }
+    `,
+
+    /* 弹层样式 */
+    css`
+      .layer {
+        &__title {
+          display: flex;
+          justify-content: space-between;
+          align-items: center;
+          width: 100%;
+          height: 60px;
+          padding: 15px;
+          font-size: 16px;
+          color: var(--color-dark-2);
+
+          wc-icon {
+            --size: 14px;
+
+            &:hover {
+              color: var(--color-red-1);
+            }
+          }
+        }
+
+        &__content {
+          display: flex;
+          position: relative;
+          width: 100%;
+          height: auto;
+          min-height: 50px;
+          word-break: break-all;
+          word-wrap: break-word;
+
+          ::slotted(&__input) {
+            flex: 1;
+            height: 36px;
+          }
+
+          ::slotted(&__toast) {
+            display: flex;
+            align-items: center;
+            width: 300px;
+            padding: 0 10px !important;
+            border-radius: 3px;
+            font-weight: normal;
+            text-indent: 8px;
+            --size: 16px;
+            color: var(--color-dark-1);
+          }
+
+          ::slotted(&__toast.style-info) {
+            border: 1px solid #ebeef5;
+            background: #edf2fc;
+            color: var(--color-grey-3);
+          }
+          ::slotted(&__toast.style-success) {
+            border: 1px solid #e1f3d8;
+            background: #f0f9eb;
+            color: var(--color-green-3);
+          }
+          ::slotted(&__toast.style-warning) {
+            border: 1px solid #faebb4;
+            background: #faecd8;
+            color: var(--color-red-1);
+          }
+          ::slotted(&__toast.style-error) {
+            border: 1px solid #f5c4c4;
+            background: #fde2e2;
+            color: var(--color-red-1);
+          }
+        }
+
+        &__ctrl {
+          display: none;
+          justify-content: flex-end;
+          width: 100%;
+          height: 60px;
+          padding: 15px;
+          line-height: 30px;
+          font-size: 14px;
+          color: #454545;
+          text-align: right;
+
+          button {
+            min-width: 64px;
+            height: 30px;
+            padding: 0 10px;
+            margin: 0 5px;
+            border: 1px solid var(--color-plain-3);
+            border-radius: 2px;
+            white-space: nowrap;
+            background: #fff;
+            font-size: inherit;
+            font-family: inherit;
+            outline: none;
+            color: inherit;
+
+            &:hover {
+              background: var(--color-plain-1);
+            }
+
+            &:active {
+              border-color: var(--color-grey-1);
+            }
+
+            &:focus {
+              box-shadow: 0 0 0 2px var(--color-plain-a);
+            }
+
+            &:last-child {
+              color: #fff;
+              background: var(--color-teal-2);
+              border-color: transparent;
+
+              &:hover {
+                background: var(--color-teal-1);
+              }
+              &:active {
+                background: var(--color-teal-3);
+              }
+              &:focus {
+                box-shadow: 0 0 0 2px var(--color-teal-a);
+              }
+            }
+
+            &::-moz-focus-inner {
+              border: none;
+            }
+          }
+        }
+      }
+    `,
+
+    css`
+      :host([mask]) {
+        height: 100%;
+        background: rgba(255, 255, 255, 0.15);
+        backdrop-filter: blur(5px);
+      }
+
+      :host([type='alert']),
+      :host([type='confirm']),
+      :host([type='prompt']) {
+        .layer {
+          max-width: 600px;
+          min-width: 300px;
+          background: #fff;
+
+          &__content {
+            padding: 0 15px;
+          }
+        }
+      }
+      :host([type='notify']) {
+        .layer {
+          width: 300px;
+          height: 120px;
+
+          &__content {
+            padding: 0 15px;
+          }
+        }
+      }
+      :host([type='toast']) {
+        .layer {
+          box-shadow: none;
+
+          &__content {
+            min-height: 40px;
+          }
+        }
+      }
+    `
+  ]
+
+  mounted() {
+    this.$refs.box.$anim.start()
+  }
+
+  updated() {
+    this.$refs.box.$anim.start()
+  }
+
+  render() {
+    return html`
+      <div ref="box" #animation=${{ type: 'fade' }} class="layer">
+        <div
+          class="layer__title noselect"
+          style=${styleMap({ display: !!this.title ? '' : 'none' })}
+        >
+          ${this.title}${this.type === 'notify'
+            ? html`<wc-icon name="close"></wc-icon>`
+            : ''}
+        </div>
+        <div class="layer__content">
+          <slot></slot>
+        </div>
+        <div class="layer__ctrl noselect">
+          ${this.btns.map((s, i) => html`<button data-idx=${i}>${s}</button>`)}
+        </div>
+      </div>
+    `
+  }
+}
+
+function layer(opt = {}) {
+  let layDom = document.createElement('wc-layer')
+  let { type = 'common', content = '' } = opt
+
+  if (type === 'toast') {
+    opt = {
+      type,
+      content,
+      from: { top: 0 },
+      to: { top: '30px' }
+    }
+
+    if (toastInstance) {
+      toastInstance.close(true)
+    }
+    toastInstance = layDom
+  } else {
+    layDom.mask = opt.mask
+
+    if (opt.btns === false) {
+      layDom.btns = []
+    } else if (opt.btns && opt.btns.length) {
+      layDom.btns = opt.btns
+    } else {
+      layDom.btns = LANG_BTNS.concat()
+    }
+
+    if (opt.intercept && typeof opt.intercept === 'function') {
+      layDom.intercept = opt.intercept
+    }
+
+    layDom.mask = opt.mask
+    layDom['mask-close'] = opt['mask-close']
+
+    if (opt.hasOwnProperty('overflow')) {
+      layDom.overflow = opt.overflow
+    }
+
+    /* 额外样式 */
+    layDom['mask-color'] = opt['mask-color']
+
+    layDom.blur = opt.blur
+
+    layDom.radius = opt.radius
+    layDom.background = opt.background
+
+    if (opt.size && typeof opt.size === 'object') {
+      layDom.size = opt.size
+    }
+
+    // 这3种类型, 只允许同时存在1个, 如果之前有弹出则关闭
+    if (UNIQUE_TYPES.includes(opt.type)) {
+      if (uniqueInstance) {
+        uniqueInstance.close(true)
+      }
+      uniqueInstance = layDom
+    }
+  }
+
+  if (opt.to && typeof opt.to === 'object') {
+    layDom.to = opt.to
+    if (opt.from && typeof opt.from === 'object') {
+      layDom.from = opt.from
+    } else {
+      layDom.from = opt.to
+    }
+  }
+
+  layDom.type = opt.type
+  layDom.title = opt.title
+  if (opt.hasOwnProperty('fixed')) {
+    layDom.fixed = opt.fixed
+  }
+
+  layDom.innerHTML = content
+  layDom.wrapped = false // 用于区分是API创建的还是包裹现有的节点
+  document.body.appendChild(layDom)
+
+  return layDom.promise
+}
+
+layer.alert = function (content, title = LANG_TITLE, btns) {
+  if (typeof title === 'object') {
+    btns = title
+    title = LANG_TITLE
+  }
+  return this({
+    type: 'alert',
+    title,
+    content,
+    mask: true,
+    btns
+  })
+}
+
+layer.confirm = function (content, title = LANG_TITLE, btns) {
+  if (typeof title === 'object') {
+    btns = title
+    title = LANG_TITLE
+  }
+  return this({
+    type: 'confirm',
+    title,
+    content,
+    mask: true,
+    btns
+  })
+}
+
+layer.prompt = function (title = LANG_TITLE, defaultValue = '', intercept) {
+  if (typeof defaultValue === 'function') {
+    intercept = defaultValue
+    defaultValue = ''
+  }
+
+  if (!intercept) {
+    intercept = function (val, done) {
+      if (val) {
+        done()
+      }
+    }
+  }
+  return this({
+    type: 'prompt',
+    title,
+    content: `<wc-input autofocus class="layer__content__input" value="${defaultValue}"></wc-input>`,
+    mask: true,
+    intercept
+  })
+}
+
+layer.notify = function (content) {
+  return this({
+    type: 'notify',
+    title: '通知',
+    content,
+    blur: true,
+    from: { right: '-300px', top: 0 },
+    to: { right: 0 }
+  })
+}
+
+layer.toast = function (txt, type = 'info') {
+  var ico = type
+  switch (type) {
+    case 'info':
+    case 'warning':
+      break
+    case 'error':
+      ico = 'deny'
+      break
+    case 'success':
+      ico = 'get'
+      break
+    default:
+      ico = 'info'
+  }
+
+  return this({
+    content: `
+      <div class="layer__content__toast style-${type}">
+        <wc-icon is="${ico}"></wc-icon>
+        <span class="toast-txt">${txt}</span>
+      </div>`,
+    type: 'toast'
+  })
+}
+
+Layer.reg('layer')
+window.layer = layer
diff --git a/开发规范.md b/开发规范.md
index 963c1a2..6f543ca 100644
--- a/开发规范.md
+++ b/开发规范.md
@@ -13,15 +13,14 @@
   - `type=help`  灰色
 
 3. 尺寸, 主要指 高度
-  > 需要注意的是, 这里的高度, 仅为组件本身应该占的高度, 而非"可视内容"的真实高度, 比如 开头按钮, 实际上就可以不需要那么大。
+  > 需要注意的是, 这里的高度, 仅为组件本身应该占的高度, 而非"可视内容"的真实高度, 比如 开关按钮, 实际上就可以不需要那么大。
 
   - `size=s`  小号, 20px
   - `size=m`  中号, 24px
   - `size=l`  大号,  32px (默认值)
   - `size=xl`  加大号, 36px
   - `size=xxl`  加加大号, 44px
-  - `size=xxxl`  加加加加大号, 52px
-  - `size=xxxxl`  特大号,   64px
+  - `size=xxxl`  加加加大号, 52px
 
 4. 自带点击事件的组件, 统一增加"节流/防抖"逻辑
   > 统一为增加 `lazy="1000"` 属性实现
\ No newline at end of file