vant-weapp/dist/notify/index.js

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

VantComponent({
  props: {
    text: String,
    color: {
      type: String,
      value: '#fff'
    },
    backgroundColor: {
      type: String,
      value: '#e64340'
    },
    duration: {
      type: Number,
      value: 3000
    }
  },

  methods: {
    show() {
      const { duration } = this.data;

      clearTimeout(this.timer);
      this.setData({
        show: true
      });

      if (duration > 0 && duration !== Infinity) {
        this.timer = setTimeout(() => {
          this.hide();
        }, duration);
      }
    },

    hide() {
      clearTimeout(this.timer);
      this.setData({
        show: false
      });
    }
  }
});