vant-weapp/lib/button/index.wxml

<wxs src="../wxs/utils.wxs" module="utils" />

<button
  id="{{ id }}"
  class="custom-class {{ utils.bem('button', [type, size, { block, round, plain, square, loading, disabled, hairline, unclickable: disabled || loading }]) }} {{ hairline ? 'van-hairline--surround' : '' }}"
  hover-class="van-button--active hover-class"
  lang="{{ lang }}"
  style="{{ baseStyle }} {{ customStyle }}"
  open-type="{{ openType }}"
  business-id="{{ businessId }}"
  session-from="{{ sessionFrom }}"
  send-message-title="{{ sendMessageTitle }}"
  send-message-path="{{ sendMessagePath }}"
  send-message-img="{{ sendMessageImg }}"
  show-message-card="{{ showMessageCard }}"
  app-parameter="{{ appParameter }}"
  aria-label="{{ ariaLabel }}"
  bindtap="{{ !disabled ? 'onClick' : 'noop' }}"
  bindgetuserinfo="{{ !disabled ? 'bindGetUserInfo' : 'noop' }}"
  bindcontact="{{ !disabled ? 'bindContact' : 'noop' }}"
  bindgetphonenumber="{{ !disabled ? 'bindGetPhoneNumber' : 'noop' }}"
  binderror="{{ !disabled ? 'bindError' : 'noop' }}"
  bindlaunchapp="{{ !disabled ? 'bindLaunchApp' : 'noop' }}"
  bindopensetting="{{ !disabled ? 'bindOpenSetting' : 'noop' }}"
>
  <block wx:if="{{ loading }}">
    <van-loading
      custom-class="loading-class"
      size="{{ loadingSize }}"
      type="{{ loadingType }}"
      color="{{ loadingColor(type,color,plain) }}"
    />
    <view
      wx:if="{{ loadingText }}"
      class="van-button__loading-text"
    >
      {{ loadingText }}
    </view>
  </block>
  <block wx:else>
    <van-icon
      wx:if="{{ icon }}"
      size="1.2em"
      name="{{ icon }}"
      class="van-button__icon"
      custom-style="line-height: inherit;"
    />
    <view class="van-button__text">
      <slot />
    </view>
  </block>
</button>


<wxs module="loadingColor">
function get(type, color,plain) {
  if(plain) {
    return color ? color: '#c9c9c9';
  }

  if(type === 'default') {
    return '#c9c9c9';
  }
  return 'white';
}

module.exports = get;
</wxs>