vant-weapp/packages/icon/index.ts

import { VantComponent } from '../common/component';
import { addUnit } from '../common/utils';

VantComponent({
  props: {
    info: null,
    size: {
      type: null,
      observer: 'setSizeWithUnit'
    },
    color: String,
    customStyle: String,
    classPrefix: {
      type: String,
      value: 'van-icon'
    },
    name: {
      type: String,
      observer(val) {
        this.setData({
          isImageName: val.indexOf('/') !== -1
        });
      }
    }
  },

  data: {
    sizeWithUnit: null,
  },

  methods: {
    onClick() {
      this.$emit('click');
    },

    setSizeWithUnit(size: string | number): void {
      this.setData({
        sizeWithUnit: addUnit(size)
      });
    }
  }
});