laundry/node_modules/@vant/weapp/dist/collapse/index.js

import { VantComponent } from '../common/component';
import { useChildren } from '../common/relation';
VantComponent({
    relation: useChildren('collapse-item'),
    props: {
        value: {
            type: null,
            observer: 'updateExpanded',
        },
        accordion: {
            type: Boolean,
            observer: 'updateExpanded',
        },
        border: {
            type: Boolean,
            value: true,
        },
    },
    methods: {
        updateExpanded() {
            this.children.forEach((child) => {
                child.updateExpanded();
            });
        },
        switch(name, expanded) {
            const { accordion, value } = this.data;
            const changeItem = name;
            if (!accordion) {
                name = expanded
                    ? (value || []).concat(name)
                    : (value || []).filter((activeName) => activeName !== name);
            }
            else {
                name = expanded ? name : '';
            }
            if (expanded) {
                this.$emit('open', changeItem);
            }
            else {
                this.$emit('close', changeItem);
            }
            this.$emit('change', name);
            this.$emit('input', name);
        },
    },
});