bug fix and performance improvements

miniprogram/miniprogram_npm/tdesign-miniprogram/stepper/README.en-US.md

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+:: BASE_DOC ::
+
+## API
+
+### Stepper Props
+
+name | type | default | description | required
+-- | -- | -- | -- | --
+disable-input | Boolean | false | \- | N
+disabled | Boolean | false | \- | N
+external-classes | Array | - | `['t-class', 't-class-input', 't-class-add', 't-class-minus']` | N
+input-width | Number | - | \- | N
+max | Number | 100 | \- | N
+min | Number | 0 | \- | N
+step | Number | 1 | \- | N
+theme | String | normal | stylish。options：normal/grey | N
+value | String / Number | 0 | \- | N
+default-value | String / Number | undefined | uncontrolled property | N
+
+### Stepper Events
+
+name | params | description
+-- | -- | --
+blur | `({ type: string \| number })` | \-
+change | `({ value: string \| number })` | \-
+overlimit | `({type: 'minus' \| 'plus'})` | \-
+
+
+### CSS Variables
+The component provides the following CSS variables, which can be used to customize styles.
+Name | Default Value | Description 
+-- | -- | --
+--td-stepper-border-color | @component-border | - 
+--td-stepper-border-radius | @radius-small | - 
+--td-stepper-input-color | @font-gray-1 | - 
+--td-stepper-input-disabled-color | @font-gray-4 | -