diff --git a/src/form/checkbox.wc b/src/form/checkbox.wc
index 607716a..21ef8d6 100644
--- a/src/form/checkbox.wc
+++ b/src/form/checkbox.wc
@@ -26,17 +26,21 @@ export default class CheckboxGroup {
 
   _updateChildrenStat(checkAll) {
     Array.from(this.children).forEach(it => {
-      if (it.tagName === 'WC-CHECKBOX' && it.root) {
-        if (checkAll) {
-          it.disabled = this.disabled
-          it.readOnly = this.readOnly
-        }
+      if (it.tagName === 'WC-CHECKBOX') {
+        if (it.root) {
+          if (checkAll) {
+            it.disabled = this.disabled
+            it.readOnly = this.readOnly
+          }
 
-        if (this.value.includes(it.value)) {
-          it.checked = true
-        } else {
-          it.checked = false
+          if (this.value.includes(it.value)) {
+            it.checked = true
+          } else {
+            it.checked = false
+          }
         }
+      } else {
+        it.remove()
       }
     })
   }
diff --git a/src/form/dropdown.wc b/src/form/dropdown.wc
index 1476a86..63cc886 100644
--- a/src/form/dropdown.wc
+++ b/src/form/dropdown.wc
@@ -167,13 +167,17 @@ export default class Dropdown {
 
   _updateChildrenStat() {
     Array.from(this.children).forEach(it => {
-      if (it.tagName === 'WC-OPTION' && it.root) {
-        if (it.value === this.props.value) {
-          it.setAttribute('active', '')
-          this.__INPUT__.value = it.label || it.textContent
-        } else {
-          it.removeAttribute('active')
+      if (it.tagName === 'WC-OPTION') {
+        if (it.root) {
+          if (it.value === this.props.value) {
+            it.setAttribute('active', '')
+            this.__INPUT__.value = it.label || it.textContent
+          } else {
+            it.removeAttribute('active')
+          }
         }
+      } else {
+        it.remove()
       }
     })
   }
diff --git a/src/form/radio.wc b/src/form/radio.wc
index 3ce7a82..59b5697 100644
--- a/src/form/radio.wc
+++ b/src/form/radio.wc
@@ -26,17 +26,21 @@ export default class RadioGroup {
 
   _updateChildrenStat(checkAll) {
     Array.from(this.children).forEach(it => {
-      if (it.tagName === 'WC-RADIO' && it.root) {
-        if (checkAll) {
-          it.disabled = this.disabled
-          it.readOnly = this.readOnly
-        }
+      if (it.tagName === 'WC-RADIO') {
+        if (it.root) {
+          if (checkAll) {
+            it.disabled = this.disabled
+            it.readOnly = this.readOnly
+          }
 
-        if (it.value === this.props.value) {
-          it.checked = true
-        } else {
-          it.checked = false
+          if (it.value === this.props.value) {
+            it.checked = true
+          } else {
+            it.checked = false
+          }
         }
+      } else {
+        it.remove()
       }
     })
   }
diff --git a/src/markd/core.js b/src/markd/core.js
index 0811116..b9448b7 100644
--- a/src/markd/core.js
+++ b/src/markd/core.js
@@ -27,6 +27,11 @@ const INLINE = {
   qlist: /((<blockquote class="md\-quote">)*?)([\+\-\*]|\d+\.) (.*)/ // 引用中的列表
 }
 
+const ATTR_BR_SYMBOL = '⨨☇'
+const NODE_BR_SYMBOL = '⨨⤶'
+const ATTR_BR_EXP = new RegExp(ATTR_BR_SYMBOL, 'g')
+const NODE_BR_EXP = new RegExp(NODE_BR_SYMBOL, 'g')
+
 const Helper = {
   // 是否分割线
   isHr(str) {
@@ -165,20 +170,20 @@ function fixed(str) {
     .replace(/\u2424/g, '\n')
     .replace(TAG_RE, (m, name, attr) => {
       // 标签内的换行, 转为一组特殊字符, 方便后面还原
-      return `<${name + attr.replace(/\n/g, '⨨☇')}>`
+      return `<${name + attr.replace(/\n/g, ATTR_BR_SYMBOL)}>`
     })
     .replace(BLOCK_RE, (m, tag, attr, txt) => {
-      return `<${tag + attr}>${txt.replace(/\n/g, '⨨⤶')}</${tag}>`
+      return `<${tag + attr}>${txt.replace(/\n/g, NODE_BR_SYMBOL)}</${tag}>`
     })
     .replace(CODEBLOCK_RE, (m, lang, txt) => {
       // 还原换行
-      let rollback = txt.replace(/⨨⤶/g, '\n').replace(/⨨☇/g, '\n')
+      let rollback = txt.replace(NODE_BR_EXP, '\n').replace(ATTR_BR_EXP, '\n')
       return '```' + lang + rollback + '```'
     })
     .replace(BLOCK_RE, (m, tag, attr, txt) => {
-      return `<${tag + attr.replace(/(⨨☇)+/g, ' ')}>${txt
-        .replace(/⨨⤶/g, '\n')
-        .replace(/(⨨☇)+/g, ' ')}</${tag}>`
+      return `<${tag + attr.replace(ATTR_BR_EXP, ' ')}>${txt
+        .replace(NODE_BR_EXP, '\n')
+        .replace(ATTR_BR_EXP, ' ')}</${tag}>`
     })
 }