初始

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

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+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);
+        },
+    },
+});