vant/packages/info/index.js

import { use, isDef } from '../utils';

const [sfc, bem] = use('info');

export default sfc(
  {
    props: {
      info: [String, Number]
    },

    render(h, { props, data }) {
      return (
        isDef(props.info) && (
          <div class={bem()} {...data}>
            {props.info}
          </div>
        )
      );
    }
  },
  true
);