shenweishi/wxcomponents/vant/dist/field/textarea.wxml

<textarea
  class="{{ utils.bem('field__control', [inputAlign, type, { disabled, error }]) }} input-class"
  fixed="{{ fixed }}"
  focus="{{ focus }}"
  cursor="{{ cursor }}"
  value="{{ innerValue }}"
  auto-focus="{{ autoFocus }}"
  disabled="{{ disabled || readonly }}"
  maxlength="{{ maxlength }}"
  placeholder="{{ placeholder }}"
  placeholder-style="{{ placeholderStyle }}"
  placeholder-class="{{ utils.bem('field__placeholder', { error, disabled }) }}"
  auto-height="{{ !!autosize }}"
  style="{{ computed.inputStyle(autosize) }}"
  cursor-spacing="{{ cursorSpacing }}"
  adjust-position="{{ adjustPosition }}"
  show-confirm-bar="{{ showConfirmBar }}"
  hold-keyboard="{{ holdKeyboard }}"
  selection-end="{{ selectionEnd }}"
  selection-start="{{ selectionStart }}"
  disable-default-padding="{{ disableDefaultPadding }}"
  bindinput="onInput"
  bindtap="onClickInput"
  bindblur="onBlur"
  bindfocus="onFocus"
  bindconfirm="onConfirm"
  bindlinechange="onLineChange"
  bindkeyboardheightchange="onKeyboardHeightChange"
/>