vant/packages/button/index.tsx

import { use } from '../utils';
import { emit, inherit } from '../utils/functional';
import { routeProps, functionalRoute } from '../mixins/router';
import Loading from '../loading';

// Types
import { RouteProps } from '../mixins/router';
import { FunctionalComponent } from '../utils/use/sfc';

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

const Button: FunctionalComponent<ButtonProps> = function(
  h,
  props,
  slots,
  ctx
) {
  const { tag, type, disabled, loading, loadingText } = props;

  const onClick = (event: Event) => {
    if (!loading && !disabled) {
      emit(ctx, 'click', event);
      functionalRoute(ctx);
    }
  };

  return (
    <tag
      type={props.nativeType}
      disabled={disabled}
      class={bem([
        type,
        props.size,
        {
          loading,
          disabled,
          block: props.block,
          plain: props.plain,
          round: props.round,
          square: props.square,
          'bottom-action': props.bottomAction
        }
      ])}
      onClick={onClick}
      {...inherit(ctx)}
    >
      {loading ? (
        [
          <Loading size="20px" color={type === 'default' ? undefined : ''} />,
          loadingText && <span class={bem('loading-text')}>{loadingText}</span>
        ]
      ) : (
        <span class={bem('text')}>
          {slots.default ? slots.default() : props.text}
        </span>
      )}
    </tag>
  );
};

export type ButtonProps = RouteProps & {
  tag?: string;
  type?: string;
  size?: string;
  text?: string;
  block?: boolean;
  plain?: boolean;
  round?: boolean;
  square?: boolean;
  loading?: boolean;
  disabled?: boolean;
  nativeType?: string;
  loadingText?: string;
  bottomAction?: boolean;
};

Button.props = {
  ...routeProps,
  text: String,
  block: Boolean,
  plain: Boolean,
  round: Boolean,
  square: Boolean,
  loading: Boolean,
  disabled: Boolean,
  nativeType: String,
  loadingText: String,
  bottomAction: Boolean,
  tag: {
    type: String,
    default: 'button'
  },
  type: {
    type: String,
    default: 'default'
  },
  size: {
    type: String,
    default: 'normal'
  }
};

export default sfc<ButtonProps>(Button);