vant

utils/dist/collapse/index.d.ts

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+export {};

utils/dist/collapse/index.js

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

utils/dist/collapse/index.json

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+{
+  "component": true
+}

utils/dist/collapse/index.wxml

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+<view class="custom-class van-collapse {{ border ? 'van-hairline--top-bottom' : '' }}">
+  <slot />
+</view>

utils/dist/collapse/index.wxss

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+@import '../common/index.wxss';