vant-weapp/dist/popup/index.js

import { VantComponent } from '../common/component';
import { transition } from '../mixins/transition';
VantComponent({
    mixins: [transition(false)],
    props: {
        transition: String,
        customStyle: String,
        overlayStyle: String,
        zIndex: {
            type: Number,
            value: 100
        },
        overlay: {
            type: Boolean,
            value: true
        },
        closeOnClickOverlay: {
            type: Boolean,
            value: true
        },
        position: {
            type: String,
            value: 'center'
        }
    },
    methods: {
        onClickOverlay() {
            this.$emit('click-overlay');
            if (this.data.closeOnClickOverlay) {
                this.$emit('close');
            }
        }
    }
});