vant-weapp/packages/select/index.wxml

<radio-group
  class="zan-select__list"
  bindchange="_handleZanSelectChange"
>
  <label wx:for="{{ items }}" wx:key="value">
    <zan-cell>
      <radio class="zan-select__radio" value="{{ item.value }}" checked="{{ item.value === checkedValue }}"/>
      <span style="{{ parse.getItemStyle(item, checkedValue, activeColor) }}">{{ item.name }}</span>
      <zan-icon
        wx:if="{{ item.value === checkedValue }}"
        slot="footer"
        type="success_no_circle"
        style="color: {{ parse.getColor(activeColor) }};font-size: 14px;"
      />
    </zan-cell>
  </label>
</radio-group>


<wxs module="parse">
function getColor(color) {
  color = color || '#ff4444'
  return color;
}

module.exports = {
  getColor: getColor,
  getItemStyle: function(item, checkedValue, activeColor) {
    var padding = item.padding * 10;
    var style = 'padding-left: ' + padding + 'px;';

    // 如果为选中状态，则高亮
    if (item.value === checkedValue) {
      style += 'color: ' + getColor(activeColor);
    }

    return style;
  }
};
</wxs>