fix: input showWordLimit parameter observer inactive

Author: yaoleyaotouoO

packages/components/src/input/index.ts

@@ -4,12 +4,17 @@ import { connect, mapProps, mapReadPretty, h } from '@formily/vue'
 import { defineComponent } from '@vue/composition-api'
 import type { Field as VanInputProps } from 'vant'
 import { Field as VanInput } from 'vant'
+import { transformComponent } from '../__builtins__/shared'
 import { resolveComponent } from '../__builtins__/shared'
 import { stylePrefix } from '../__builtins__/configs'
 import { PreviewText } from '../preview-text'
 
 export type InputProps = VanInputProps
 
+const TransformVanInput = transformComponent<InputProps>(VanInput, {
+  change: 'input',
+})
+
 export const BaseInput = observer(
   defineComponent({
     name: 'FBaseInput',
@@ -19,7 +24,7 @@ export const BaseInput = observer(
     setup(props, { attrs, slots, listeners }) {
       return () => {
         return h(
-          VanInput,
+          TransformVanInput,
           {
             class: { [`${stylePrefix}-input-asterisk`]: attrs.asterisk },
             attrs: { ...attrs, ...props },