diff --git a/src/number-keyboard/index.js b/src/number-keyboard/index.js
index 1d6ab5735..b093afae7 100644
--- a/src/number-keyboard/index.js
+++ b/src/number-keyboard/index.js
@@ -1,20 +1,12 @@
-import { Teleport, Transition } from 'vue';
+import { ref, watch, computed, Teleport, Transition } from 'vue';
 import { createNamespace } from '../utils';
 import { stopPropagation } from '../utils/dom/event';
-import { BindEventMixin } from '../mixins/bind-event';
+import { useClickOutside } from '../composition/use-click-outside';
 import Key from './Key';
 
 const [createComponent, bem] = createNamespace('number-keyboard');
 
 export default createComponent({
-  mixins: [
-    BindEventMixin(function (bind) {
-      if (this.hideOnClickOutside) {
-        bind(document.body, 'touchstart', this.onBlur);
-      }
-    }),
-  ],
-
   props: {
     show: Boolean,
     title: String,
@@ -67,47 +59,30 @@ export default createComponent({
     'update:modelValue',
   ],
 
-  watch: {
-    show(val) {
-      if (!this.transition) {
-        this.$emit(val ? 'show' : 'hide');
-      }
-    },
-  },
+  setup(props, { emit, slots }) {
+    const rootRef = ref();
 
-  computed: {
-    keys() {
-      if (this.theme === 'custom') {
-        return this.genCustomKeys();
-      }
-      return this.genDefaultKeys();
-    },
-  },
-
-  methods: {
-    genBasicKeys() {
+    const genBasicKeys = () => {
       const keys = [];
       for (let i = 1; i <= 9; i++) {
         keys.push({ text: i });
       }
       return keys;
-    },
+    };
 
-    genDefaultKeys() {
-      return [
-        ...this.genBasicKeys(),
-        { text: this.extraKey, type: 'extra' },
-        { text: 0 },
-        {
-          text: this.showDeleteKey ? this.deleteButtonText : '',
-          type: this.showDeleteKey ? 'delete' : '',
-        },
-      ];
-    },
+    const genDefaultKeys = () => [
+      ...genBasicKeys(),
+      { text: props.extraKey, type: 'extra' },
+      { text: 0 },
+      {
+        text: props.showDeleteKey ? props.deleteButtonText : '',
+        type: props.showDeleteKey ? 'delete' : '',
+      },
+    ];
 
-    genCustomKeys() {
-      const keys = this.genBasicKeys();
-      const { extraKey } = this;
+    const genCustomKeys = () => {
+      const keys = genBasicKeys();
+      const { extraKey } = props;
       const extraKeys = Array.isArray(extraKey) ? extraKey : [extraKey];
 
       if (extraKeys.length === 1) {
@@ -124,47 +99,53 @@ export default createComponent({
       }
 
       return keys;
-    },
+    };
 
-    onBlur() {
-      this.show && this.$emit('blur');
-    },
+    const keys = computed(() =>
+      props.theme === 'custom' ? genCustomKeys() : genDefaultKeys()
+    );
 
-    onClose() {
-      this.$emit('close');
-      this.onBlur();
-    },
+    const onBlur = () => {
+      if (props.show) {
+        emit('blur');
+      }
+    };
 
-    onAnimationEnd() {
-      this.$emit(this.show ? 'show' : 'hide');
-    },
+    const onClose = () => {
+      emit('close');
+      onBlur();
+    };
 
-    onPress(text, type) {
+    const onAnimationEnd = () => {
+      emit(props.show ? 'show' : 'hide');
+    };
+
+    const onPress = (text, type) => {
       if (text === '') {
         if (type === 'extra') {
-          this.onBlur();
+          onBlur();
         }
         return;
       }
 
-      const value = this.modelValue;
+      const value = props.modelValue;
 
       if (type === 'delete') {
-        this.$emit('delete');
-        this.$emit('update:modelValue', value.slice(0, value.length - 1));
+        emit('delete');
+        emit('update:modelValue', value.slice(0, value.length - 1));
       } else if (type === 'close') {
-        this.onClose();
-      } else if (value.length < this.maxlength) {
-        this.$emit('input', text);
-        this.$emit('update:modelValue', value + text);
+        onClose();
+      } else if (value.length < props.maxlength) {
+        emit('input', text);
+        emit('update:modelValue', value + text);
       }
-    },
+    };
 
-    genTitle() {
-      const { title, theme, closeButtonText } = this;
-      const titleLeft = this.$slots['title-left'];
+    const renderTitle = () => {
+      const { title, theme, closeButtonText } = props;
+      const leftSlot = slots['title-left'];
       const showClose = closeButtonText && theme === 'default';
-      const showTitle = title || showClose || titleLeft;
+      const showTitle = title || showClose || leftSlot;
 
       if (!showTitle) {
         return;
@@ -172,26 +153,26 @@ export default createComponent({
 
       return (
         <div class={bem('header')}>
-          {titleLeft && <span class={bem('title-left')}>{titleLeft}</span>}
+          {leftSlot && <span class={bem('title-left')}>{leftSlot()}</span>}
           {title && <h2 class={bem('title')}>{title}</h2>}
           {showClose && (
-            <button type="button" class={bem('close')} onClick={this.onClose}>
+            <button type="button" class={bem('close')} onClick={onClose}>
               {closeButtonText}
             </button>
           )}
         </div>
       );
-    },
+    };
 
-    genKeys() {
-      return this.keys.map((key) => {
+    const renderKeys = () => {
+      return keys.value.map((key) => {
         const slots = {};
 
         if (key.type === 'delete') {
-          slots.default = this.$slots.delete;
+          slots.default = slots.delete;
         }
         if (key.type === 'extra') {
-          slots.default = this.$slots['extra-key'];
+          slots.default = slots['extra-key'];
         }
 
         return (
@@ -202,64 +183,83 @@ export default createComponent({
             type={key.type}
             wider={key.wider}
             color={key.color}
-            onPress={this.onPress}
+            onPress={onPress}
           />
         );
       });
-    },
+    };
 
-    genSidebar() {
-      if (this.theme === 'custom') {
+    const renderSidebar = () => {
+      if (props.theme === 'custom') {
         return (
           <div class={bem('sidebar')}>
-            {this.showDeleteKey && (
+            {props.showDeleteKey && (
               <Key
-                v-slots={{ delete: this.$slots.delete }}
+                v-slots={{ delete: slots.delete }}
                 large
-                text={this.deleteButtonText}
+                text={props.deleteButtonText}
                 type="delete"
-                onPress={this.onPress}
+                onPress={onPress}
               />
             )}
             <Key
               large
-              text={this.closeButtonText}
+              text={props.closeButtonText}
               type="close"
               color="blue"
-              loading={this.closeButtonLoading}
-              onPress={this.onPress}
+              loading={props.closeButtonLoading}
+              onPress={onPress}
             />
           </div>
         );
       }
-    },
-  },
+    };
 
-  render() {
-    const Title = this.genTitle();
-    const Content = (
-      <Transition name={this.transition ? 'van-slide-up' : ''}>
-        <div
-          vShow={this.show}
-          style={{ zIndex: this.zIndex }}
-          class={bem({ unfit: !this.safeAreaInsetBottom, 'with-title': Title })}
-          onTouchstart={stopPropagation}
-          onAnimationend={this.onAnimationEnd}
-          onWebkitAnimationEnd={this.onAnimationEnd}
-        >
-          {Title}
-          <div class={bem('body')}>
-            <div class={bem('keys')}>{this.genKeys()}</div>
-            {this.genSidebar()}
-          </div>
-        </div>
-      </Transition>
+    watch(
+      () => props.show,
+      (value) => {
+        if (!props.transition) {
+          emit(value ? 'show' : 'hide');
+        }
+      }
     );
 
-    if (this.teleport) {
-      return <Teleport to={this.teleport}>{Content}</Teleport>;
-    }
+    useClickOutside({
+      event: 'touchstart',
+      element: rootRef,
+      callback: onClose,
+    });
 
-    return Content;
+    return () => {
+      const Title = renderTitle();
+      const Content = (
+        <Transition name={props.transition ? 'van-slide-up' : ''}>
+          <div
+            ref={rootRef}
+            vShow={props.show}
+            style={{ zIndex: props.zIndex }}
+            class={bem({
+              unfit: !props.safeAreaInsetBottom,
+              'with-title': !!Title,
+            })}
+            onTouchstart={stopPropagation}
+            onAnimationend={onAnimationEnd}
+            onWebkitAnimationEnd={onAnimationEnd}
+          >
+            {Title}
+            <div class={bem('body')}>
+              <div class={bem('keys')}>{renderKeys()}</div>
+              {renderSidebar()}
+            </div>
+          </div>
+        </Transition>
+      );
+
+      if (props.teleport) {
+        return <Teleport to={props.teleport}>{Content}</Teleport>;
+      }
+
+      return Content;
+    };
   },
 });