vant-weapp/dist/button/index.js

import { VantComponent } from '../common/component';
import { button } from '../mixins/button';
import { openType } from '../mixins/open-type';
VantComponent({
  mixins: [button, openType],
  classes: ['hover-class', 'loading-class'],
  data: {
    baseStyle: '',
  },
  props: {
    icon: String,
    plain: Boolean,
    block: Boolean,
    round: Boolean,
    square: Boolean,
    loading: Boolean,
    hairline: Boolean,
    disabled: Boolean,
    loadingText: String,
    customStyle: String,
    loadingType: {
      type: String,
      value: 'circular',
    },
    type: {
      type: String,
      value: 'default',
    },
    dataset: null,
    size: {
      type: String,
      value: 'normal',
    },
    loadingSize: {
      type: String,
      value: '20px',
    },
    color: {
      type: String,
      observer(color) {
        let style = '';
        if (color) {
          style += `color: ${this.data.plain ? color : 'white'};`;
          if (!this.data.plain) {
            // Use background instead of backgroundColor to make linear-gradient work
            style += `background: ${color};`;
          }
          // hide border when color is linear-gradient
          if (color.indexOf('gradient') !== -1) {
            style += 'border: 0;';
          } else {
            style += `border-color: ${color};`;
          }
        }
        if (style !== this.data.baseStyle) {
          this.setData({ baseStyle: style });
        }
      },
    },
  },
  methods: {
    onClick() {
      if (!this.data.loading) {
        this.$emit('click');
      }
    },
    noop() {},
  },
});