bug fix and performance improvements

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

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+
+
+### CSS Variables
+The component provides the following CSS variables, which can be used to customize styles.
+Name | Default Value | Description 
+-- | -- | --
+--td-search-action-color | @brand-color | - 
+--td-search-bg-color | @bg-color-secondarycontainer | - 
+--td-search-clear-icon-color | @font-gray-3 | - 
+--td-search-font-size | @font-size-m | - 
+--td-search-height | 80rpx | - 
+--td-search-icon-color | @font-gray-3 | - 
+--td-search-label-color | @font-gray-1 | - 
+--td-search-padding | 16rpx 24rpx | - 
+--td-search-placeholder-color | @font-gray-3 | - 
+--td-search-square-radius | @radius-default | - 
+--td-search-text-color | @font-gray-1 | -