diff --git a/libs/horizon/src/dom/SelectionRangeHandler.ts b/libs/horizon/src/dom/SelectionRangeHandler.ts
index e09e0dad..a8f643c1 100644
--- a/libs/horizon/src/dom/SelectionRangeHandler.ts
+++ b/libs/horizon/src/dom/SelectionRangeHandler.ts
@@ -17,7 +17,7 @@
  * 处理文本框、输入框中框选范围内的数据
  */
 
-import { getIFrameFocusedDom, isText } from './utils/Common';
+import { getIFrameFocusedDom, isNull, isText } from './utils/Common';
 
 import { isElement } from './utils/Common';
 
@@ -30,7 +30,7 @@ function setSelectionRange(dom: HTMLInputElement | HTMLTextAreaElement, range) {
   const { start, end } = range;
   let realEnd = end;
 
-  if (realEnd == null) {
+  if (isNull(realEnd)) {
     realEnd = start;
   }
 
diff --git a/libs/horizon/src/dom/utils/Common.ts b/libs/horizon/src/dom/utils/Common.ts
index 30c172cf..001a32f1 100644
--- a/libs/horizon/src/dom/utils/Common.ts
+++ b/libs/horizon/src/dom/utils/Common.ts
@@ -84,3 +84,7 @@ const types = ['button', 'input', 'select', 'textarea'];
 export function shouldAutoFocus(tagName: string, props: Props): boolean {
   return types.includes(tagName) ? Boolean(props.autoFocus) : false;
 }
+
+export function isNull(val) {
+  return val === null || val === undefined;
+}
diff --git a/libs/horizon/src/dom/validators/ValidateProps.ts b/libs/horizon/src/dom/validators/ValidateProps.ts
index f025ce63..9eabcc09 100644
--- a/libs/horizon/src/dom/validators/ValidateProps.ts
+++ b/libs/horizon/src/dom/validators/ValidateProps.ts
@@ -14,6 +14,7 @@
  */
 
 import { getPropDetails, PROPERTY_TYPE, PropDetails } from './PropertiesData';
+import { isNull } from '../utils/Common';
 
 const INVALID_EVENT_NAME_REGEX = /^on[^A-Z]/;
 
@@ -73,7 +74,7 @@ export function isInvalidValue(
   propDetails: PropDetails | null,
   isNativeTag: boolean
 ): boolean {
-  if (value == null) {
+  if (isNull(value)) {
     return true;
   }
 
@@ -104,7 +105,7 @@ export function validateProps(type, props) {
   }
 
   // style属性必须是对象
-  if (props.style != null && typeof props.style !== 'object') {
+  if (!isNull(props.style) && typeof props.style !== 'object') {
     throw new Error('style should be a object.');
   }
 
diff --git a/libs/horizon/src/dom/valueHandler/InputValueHandler.ts b/libs/horizon/src/dom/valueHandler/InputValueHandler.ts
index 824d57dd..749e85b3 100644
--- a/libs/horizon/src/dom/valueHandler/InputValueHandler.ts
+++ b/libs/horizon/src/dom/valueHandler/InputValueHandler.ts
@@ -15,6 +15,7 @@
 
 import { updateCommonProp } from '../DOMPropertiesHandler/UpdateCommonProp';
 import { Props } from '../utils/Interface';
+import { isNull } from '../utils/Common';
 
 function getInitValue(dom: HTMLInputElement, props: Props) {
   const { value, defaultValue, checked, defaultChecked } = props;
@@ -29,7 +30,7 @@ function getInitValue(dom: HTMLInputElement, props: Props) {
 export function getInputPropsWithoutValue(dom: HTMLInputElement, props: Props) {
   // checked属于必填属性，无法置
   let { checked } = props;
-  if (checked == null) {
+  if (isNull(checked)) {
     checked = getInitValue(dom, props).initChecked;
   }
 
@@ -45,12 +46,12 @@ export function getInputPropsWithoutValue(dom: HTMLInputElement, props: Props) {
 export function updateInputValue(dom: HTMLInputElement, props: Props) {
   const { value, checked } = props;
 
-  if (value != null) {
+  if (!isNull(value)) {
     // 处理 dom.value 逻辑
     if (dom.value !== String(value)) {
       dom.value = String(value);
     }
-  } else if (checked != null) {
+  } else if (!isNull(checked)) {
     updateCommonProp(dom, 'checked', checked, true);
   }
 }
@@ -60,7 +61,7 @@ export function setInitInputValue(dom: HTMLInputElement, props: Props) {
   const { value, defaultValue } = props;
   const { initValue, initChecked } = getInitValue(dom, props);
 
-  if (value != null || defaultValue != null) {
+  if (!isNull(value) || !isNull(defaultValue)) {
     // value 的使用优先级 value 属性 > defaultValue 属性 > 空字符串
     const initValueStr = String(initValue);
 
diff --git a/libs/horizon/src/dom/valueHandler/SelectValueHandler.ts b/libs/horizon/src/dom/valueHandler/SelectValueHandler.ts
index fb9f859e..86297315 100644
--- a/libs/horizon/src/dom/valueHandler/SelectValueHandler.ts
+++ b/libs/horizon/src/dom/valueHandler/SelectValueHandler.ts
@@ -14,6 +14,7 @@
  */
 
 import { HorizonSelect, Props } from '../utils/Interface';
+import { isNull } from '../utils/Common';
 
 function updateMultipleValue(options, newValues) {
   const newValueSet = new Set();
@@ -69,18 +70,18 @@ export function updateSelectValue(dom: HorizonSelect, props: Props, isInit = fal
   dom._multiple = newMultiple;
 
   // 设置了 value 属性
-  if (value != null) {
+  if (!isNull(value)) {
     updateValue(dom.options, value, newMultiple);
   } else if (oldMultiple !== newMultiple) {
     // 修改了 multiple 属性
     // 切换 multiple 之后，如果设置了 defaultValue 需要重新应用
-    if (defaultValue != null) {
+    if (!isNull(defaultValue)) {
       updateValue(dom.options, defaultValue, newMultiple);
     } else {
       // 恢复到未选定状态
       updateValue(dom.options, newMultiple ? [] : '', newMultiple);
     }
-  } else if (isInit && defaultValue != null) {
+  } else if (isInit && !isNull(defaultValue)) {
     // 设置了 defaultValue 属性
     updateValue(dom.options, defaultValue, newMultiple);
   }
diff --git a/libs/horizon/src/dom/valueHandler/TextareaValueHandler.ts b/libs/horizon/src/dom/valueHandler/TextareaValueHandler.ts
index 82b2203e..e852cd1f 100644
--- a/libs/horizon/src/dom/valueHandler/TextareaValueHandler.ts
+++ b/libs/horizon/src/dom/valueHandler/TextareaValueHandler.ts
@@ -14,12 +14,13 @@
  */
 
 import { Props } from '../utils/Interface';
+import { isNull } from '../utils/Common';
 
 // 值的优先级 value > children > defaultValue
 function getInitValue(props: Props) {
   const { value } = props;
 
-  if (value == null) {
+  if (isNull(value)) {
     const { defaultValue, children } = props;
     let initValue = defaultValue;
 
@@ -30,7 +31,7 @@ function getInitValue(props: Props) {
     }
 
     // defaultValue 属性未配置，置为空字符串
-    initValue = initValue != null ? initValue : '';
+    initValue = initValue ?? '';
     return initValue;
   } else {
     return value;
diff --git a/libs/horizon/src/event/EventBinding.ts b/libs/horizon/src/event/EventBinding.ts
index e4e0f59d..56e1567c 100644
--- a/libs/horizon/src/event/EventBinding.ts
+++ b/libs/horizon/src/event/EventBinding.ts
@@ -62,13 +62,6 @@ function isCaptureEvent(horizonEventName) {
   return horizonEventName.slice(-7) === 'Capture';
 }
 
-// 利用冒泡事件模拟不冒泡事件，需要直接在根节点绑定
-export function listenSimulatedDelegatedEvents(root: VNode) {
-  for (let i = 0; i < simulatedDelegatedEvents.length; i++) {
-    lazyDelegateOnRoot(root, simulatedDelegatedEvents[i]);
-  }
-}
-
 // 事件懒委托，当用户定义事件后，再进行委托到根节点
 export function lazyDelegateOnRoot(currentRoot: VNode, eventName: string) {
   currentRoot.delegatedEvents.add(eventName);
@@ -80,11 +73,8 @@ export function lazyDelegateOnRoot(currentRoot: VNode, eventName: string) {
     const nativeFullName = isCapture ? nativeEvent + 'capture' : nativeEvent;
 
     // 事件存储在DOM节点属性，避免多个VNode(root和portal)对应同一个DOM, 造成事件重复监听
-    let events = currentRoot.realNode.$EV;
-
-    if (!events) {
-      events = (currentRoot.realNode as any).$EV = {};
-    }
+    currentRoot.realNode.$EV = currentRoot.realNode.$EV || {};
+    const events = currentRoot.realNode.$EV;
 
     if (!events[nativeFullName]) {
       events[nativeFullName] = listenToNativeEvent(nativeEvent, currentRoot.realNode, isCapture);
@@ -92,6 +82,13 @@ export function lazyDelegateOnRoot(currentRoot: VNode, eventName: string) {
   });
 }
 
+// 利用冒泡事件模拟不冒泡事件，需要直接在根节点绑定
+export function listenSimulatedDelegatedEvents(root: VNode) {
+  for (let i = 0; i < simulatedDelegatedEvents.length; i++) {
+    lazyDelegateOnRoot(root, simulatedDelegatedEvents[i]);
+  }
+}
+
 // 通过horizon事件名获取到native事件名
 function getNativeEvtName(horizonEventName, capture) {
   let nativeName;
diff --git a/libs/horizon/src/event/FormValueController.ts b/libs/horizon/src/event/FormValueController.ts
index 3c63a299..2e296e6d 100644
--- a/libs/horizon/src/event/FormValueController.ts
+++ b/libs/horizon/src/event/FormValueController.ts
@@ -14,7 +14,7 @@
  */
 
 import { getVNodeProps } from '../dom/DOMInternalKeys';
-import { getDomTag } from '../dom/utils/Common';
+import { getDomTag, isNull } from '../dom/utils/Common';
 import { Props } from '../dom/utils/Interface';
 import { updateTextareaValue } from '../dom/valueHandler/TextareaValueHandler';
 import { updateInputHandlerIfChanged } from '../dom/valueHandler/ValueChangeHandler';
@@ -41,14 +41,14 @@ function controlInputValue(inputDom: HTMLInputElement, props: Props) {
   const { name, type } = props;
 
   // 如果是 radio，找出同一form内，name相同的Radio，更新它们Handler的Value
-  if (type === 'radio' && name != null) {
+  if (type === 'radio' && !isNull(name)) {
     const radioList = document.querySelectorAll<HTMLInputElement>(`input[type="radio"][name="${name}"]`);
     for (let i = 0; i < radioList.length; i++) {
       const radio = radioList[i];
       if (radio === inputDom) {
         continue;
       }
-      if (radio.form != null && inputDom.form != null && radio.form !== inputDom.form) {
+      if (!isNull(radio.form) && !isNull(inputDom.form) && radio.form !== inputDom.form) {
         continue;
       }
 
diff --git a/libs/horizon/src/event/ListenerGetter.ts b/libs/horizon/src/event/ListenerGetter.ts
index 3b19cf2a..02feee6f 100644
--- a/libs/horizon/src/event/ListenerGetter.ts
+++ b/libs/horizon/src/event/ListenerGetter.ts
@@ -87,34 +87,30 @@ export function getListenersFromTree(
   return listeners;
 }
 
-// 获取enter和leave事件队列
-export function collectMouseListeners(
-  leaveEvent: null | WrappedEvent,
-  enterEvent: null | WrappedEvent,
-  from: VNode | null,
-  to: VNode | null,
-): ListenerUnitList {
-  // 确定公共父节点，作为在树上遍历的终点
-  const commonParent = from && to ? getCommonAncestor(from, to) : null;
-  let leaveEventList: ListenerUnitList = [];
-  if (from && leaveEvent) {
-    // 遍历树，获取绑定的leave事件
-    leaveEventList = getMouseListenersFromTree(
-      leaveEvent,
-      from,
-      commonParent,
-    );
+
+// 获取父节点
+function getParent(inst: VNode | null): VNode | null {
+  if (inst === null) {
+    return null;
   }
-  let enterEventList: ListenerUnitList = [];
-  if (to && enterEvent) {
-    // 先触发父节点enter事件，所以需要逆序
-    enterEventList = getMouseListenersFromTree(
-      enterEvent,
-      to,
-      commonParent,
-    ).reverse();
+  do {
+    inst = inst.parent;
+  } while (inst && inst.tag !== DomComponent);
+  return inst || null;
+}
+
+// 寻找两个节点的共同最近祖先，如果没有则返回null
+function getCommonAncestor(instA: VNode, instB: VNode): VNode | null {
+  const parentsSet = new Set<VNode>();
+  for (let tempA: VNode | null = instA; tempA; tempA = getParent(tempA)) {
+    parentsSet.add(tempA);
   }
-  return [...leaveEventList, ...enterEventList];
+  for (let tempB: VNode | null = instB; tempB; tempB = getParent(tempB)) {
+    if (parentsSet.has(tempB)) {
+      return tempB;
+    }
+  }
+  return null;
 }
 
 function getMouseListenersFromTree(
@@ -149,27 +145,32 @@ function getMouseListenersFromTree(
   return listeners;
 }
 
-// 寻找两个节点的共同最近祖先，如果没有则返回null
-function getCommonAncestor(instA: VNode, instB: VNode): VNode | null {
-  const parentsSet = new Set<VNode>();
-  for (let tempA: VNode | null = instA; tempA; tempA = getParent(tempA)) {
-    parentsSet.add(tempA);
+// 获取enter和leave事件队列
+export function collectMouseListeners(
+  leaveEvent: null | WrappedEvent,
+  enterEvent: null | WrappedEvent,
+  from: VNode | null,
+  to: VNode | null,
+): ListenerUnitList {
+  // 确定公共父节点，作为在树上遍历的终点
+  const commonParent = from && to ? getCommonAncestor(from, to) : null;
+  let leaveEventList: ListenerUnitList = [];
+  if (from && leaveEvent) {
+    // 遍历树，获取绑定的leave事件
+    leaveEventList = getMouseListenersFromTree(
+      leaveEvent,
+      from,
+      commonParent,
+    );
   }
-  for (let tempB: VNode | null = instB; tempB; tempB = getParent(tempB)) {
-    if (parentsSet.has(tempB)) {
-      return tempB;
-    }
+  let enterEventList: ListenerUnitList = [];
+  if (to && enterEvent) {
+    // 先触发父节点enter事件，所以需要逆序
+    enterEventList = getMouseListenersFromTree(
+      enterEvent,
+      to,
+      commonParent,
+    ).reverse();
   }
-  return null;
-}
-
-// 获取父节点
-function getParent(inst: VNode | null): VNode | null {
-  if (inst === null) {
-    return null;
-  }
-  do {
-    inst = inst.parent;
-  } while (inst && inst.tag !== DomComponent);
-  return inst || null;
+  return [...leaveEventList, ...enterEventList];
 }
diff --git a/libs/horizon/src/renderer/diff/nodeDiffComparator.ts b/libs/horizon/src/renderer/diff/nodeDiffComparator.ts
index 42f30b53..83798c68 100644
--- a/libs/horizon/src/renderer/diff/nodeDiffComparator.ts
+++ b/libs/horizon/src/renderer/diff/nodeDiffComparator.ts
@@ -182,6 +182,10 @@ function getNewNode(parentNode: VNode, newChild: any, oldNode: VNode | null) {
         }
         break;
       }
+      break;
+    }
+    default: {
+      break;
     }
   }
 
@@ -374,7 +378,7 @@ function diffArrayNodesHandler(parentNode: VNode, firstChild: VNode | null, newC
   // 4. 新节点还有一部分，但是老节点已经没有了
   if (oldNode === null) {
     let isDirectAdd = false;
-    // TODO: 是否可以扩大至非dom类型节点
+    // 是否可以扩大至非dom类型节点待确认
     // 如果dom节点在上次添加前没有节点，说明本次添加时，可以直接添加到最后，不需要通过 getSiblingDom 函数找到 before 节点
     if (
       parentNode.tag === DomComponent &&
@@ -513,7 +517,7 @@ function diffIteratorNodesHandler(
 }
 
 // 新节点是字符串类型
-function diffStringNodeHandler(parentNode: VNode, newChild: any, firstChildVNode: VNode, isComparing: boolean) {
+function diffStringNodeHandler(parentNode: VNode, newChild: any, firstChildVNode: VNode | null, isComparing: boolean) {
   let newTextNode: VNode | null = null;
 
   // 第一个vNode是Text，则复用
@@ -560,7 +564,7 @@ function diffObjectNodeHandler(
   }
 
   let resultNode: VNode | null = null;
-  let startDelVNode = firstChildVNode;
+  let startDelVNode: VNode | null = firstChildVNode;
   if (newChild.vtype === TYPE_COMMON_ELEMENT) {
     if (canReuseNode) {
       // 可以复用