vant-weapp/dist/popup/index.js

import { VantComponent } from '../common/component';
import { transition } from '../mixins/transition';
import { iphonex } from '../mixins/iphonex';
VantComponent({
  classes: ['enter-class', 'enter-active-class', 'enter-to-class', 'leave-class', 'leave-active-class', 'leave-to-class'],
  mixins: [transition(false), iphonex],
  props: {
    transition: {
      type: String,
      observer: 'observeClass'
    },
    customStyle: String,
    overlayStyle: String,
    zIndex: {
      type: Number,
      value: 100
    },
    overlay: {
      type: Boolean,
      value: true
    },
    closeOnClickOverlay: {
      type: Boolean,
      value: true
    },
    position: {
      type: String,
      value: 'center',
      observer: 'observeClass'
    }
  },
  created: function created() {
    this.observeClass();
  },
  methods: {
    onClickOverlay: function onClickOverlay() {
      this.$emit('click-overlay');

      if (this.data.closeOnClickOverlay) {
        this.$emit('close');
      }
    },
    observeClass: function observeClass() {
      var _this$data = this.data,
          transition = _this$data.transition,
          position = _this$data.position;
      this.updateClasses(transition || position);
    }
  }
});