提交初始版本，使用vant ui库

miniprogram_npm/@vant/weapp/collapse-item/animate.d.ts

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+/// <reference types="miniprogram-api-typings" />
+export declare function setContentAnimate(context: WechatMiniprogram.Component.TrivialInstance, expanded: boolean, mounted: boolean): void;

miniprogram_npm/@vant/weapp/collapse-item/animate.js

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+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.setContentAnimate = void 0;
+var utils_1 = require("../common/utils");
+function useAnimation(context, expanded, mounted, height) {
+    var animation = wx.createAnimation({
+        duration: 0,
+        timingFunction: 'ease-in-out',
+    });
+    if (expanded) {
+        if (height === 0) {
+            animation.height('auto').top(1).step();
+        }
+        else {
+            animation
+                .height(height)
+                .top(1)
+                .step({
+                duration: mounted ? 300 : 1,
+            })
+                .height('auto')
+                .step();
+        }
+        context.setData({
+            animation: animation.export(),
+        });
+        return;
+    }
+    animation.height(height).top(0).step({ duration: 1 }).height(0).step({
+        duration: 300,
+    });
+    context.setData({
+        animation: animation.export(),
+    });
+}
+function setContentAnimate(context, expanded, mounted) {
+    (0, utils_1.getRect)(context, '.van-collapse-item__content')
+        .then(function (rect) { return rect.height; })
+        .then(function (height) {
+        useAnimation(context, expanded, mounted, height);
+    });
+}
+exports.setContentAnimate = setContentAnimate;

miniprogram_npm/@vant/weapp/collapse-item/index.d.ts

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+export {};

miniprogram_npm/@vant/weapp/collapse-item/index.js

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+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+var component_1 = require("../common/component");
+var relation_1 = require("../common/relation");
+var animate_1 = require("./animate");
+(0, component_1.VantComponent)({
+    classes: ['title-class', 'content-class'],
+    relation: (0, relation_1.useParent)('collapse'),
+    props: {
+        size: String,
+        name: null,
+        title: null,
+        value: null,
+        icon: String,
+        label: String,
+        disabled: Boolean,
+        clickable: Boolean,
+        border: {
+            type: Boolean,
+            value: true,
+        },
+        isLink: {
+            type: Boolean,
+            value: true,
+        },
+    },
+    data: {
+        expanded: false,
+    },
+    mounted: function () {
+        this.updateExpanded();
+        this.mounted = true;
+    },
+    methods: {
+        updateExpanded: function () {
+            if (!this.parent) {
+                return;
+            }
+            var _a = this.parent.data, value = _a.value, accordion = _a.accordion;
+            var _b = this.parent.children, children = _b === void 0 ? [] : _b;
+            var name = this.data.name;
+            var index = children.indexOf(this);
+            var currentName = name == null ? index : name;
+            var expanded = accordion
+                ? value === currentName
+                : (value || []).some(function (name) { return name === currentName; });
+            if (expanded !== this.data.expanded) {
+                (0, animate_1.setContentAnimate)(this, expanded, this.mounted);
+            }
+            this.setData({ index: index, expanded: expanded });
+        },
+        onClick: function () {
+            if (this.data.disabled) {
+                return;
+            }
+            var _a = this.data, name = _a.name, expanded = _a.expanded;
+            var index = this.parent.children.indexOf(this);
+            var currentName = name == null ? index : name;
+            this.parent.switch(currentName, !expanded);
+        },
+    },
+});

miniprogram_npm/@vant/weapp/collapse-item/index.json

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+{
+  "component": true,
+  "usingComponents": {
+    "van-cell": "../cell/index"
+  }
+}

miniprogram_npm/@vant/weapp/collapse-item/index.wxml

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+<wxs src="../wxs/utils.wxs" module="utils" />
+
+<view class="van-collapse-item custom-class {{ index !== 0 ? 'van-hairline--top' : '' }}">
+  <van-cell
+    size="{{ size }}"
+    title="{{ title }}"
+    title-class="title-class"
+    icon="{{ icon }}"
+    value="{{ value }}"
+    label="{{ label }}"
+    is-link="{{ isLink }}"
+    clickable="{{ clickable }}"
+    border="{{ border && expanded }}"
+    class="{{ utils.bem('collapse-item__title', { disabled, expanded }) }}"
+    right-icon-class="van-cell__right-icon"
+    custom-class="van-cell"
+    hover-class="van-cell--hover"
+    bind:click="onClick"
+  >
+    <slot
+      name="title"
+      slot="title"
+    />
+    <slot
+      name="icon"
+      slot="icon"
+    />
+    <slot name="value" />
+    <slot
+      name="right-icon"
+      slot="right-icon"
+    />
+  </van-cell>
+  <view
+    class="{{ utils.bem('collapse-item__wrapper') }}"
+    style="height: 0;"
+    animation="{{ animation }}"
+  >
+    <view
+      class="van-collapse-item__content content-class"
+    >
+      <slot />
+    </view>
+  </view>
+</view>

miniprogram_npm/@vant/weapp/collapse-item/index.wxss

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+@import '../common/index.wxss';.van-collapse-item__title .van-cell__right-icon{transform:rotate(90deg);transition:transform var(--collapse-item-transition-duration,.3s)}.van-collapse-item__title--expanded .van-cell__right-icon{transform:rotate(-90deg)}.van-collapse-item__title--disabled .van-cell,.van-collapse-item__title--disabled .van-cell__right-icon{color:var(--collapse-item-title-disabled-color,#c8c9cc)!important}.van-collapse-item__title--disabled .van-cell--hover{background-color:#fff!important}.van-collapse-item__wrapper{overflow:hidden}.van-collapse-item__content{background-color:var(--collapse-item-content-background-color,#fff);color:var(--collapse-item-content-text-color,#969799);font-size:var(--collapse-item-content-font-size,13px);line-height:var(--collapse-item-content-line-height,1.5);padding:var(--collapse-item-content-padding,15px)}