提交工程，小程序源码已完成，单片机待完成

wex_small/node_modules/@vant/weapp/dist/sidebar/index.d.ts

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+export {};

wex_small/node_modules/@vant/weapp/dist/sidebar/index.js

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+import { VantComponent } from '../common/component';
+import { useChildren } from '../common/relation';
+VantComponent({
+    relation: useChildren('sidebar-item', function () {
+        this.setActive(this.data.activeKey);
+    }),
+    props: {
+        activeKey: {
+            type: Number,
+            value: 0,
+            observer: 'setActive',
+        },
+    },
+    beforeCreate() {
+        this.currentActive = -1;
+    },
+    methods: {
+        setActive(activeKey) {
+            const { children, currentActive } = this;
+            if (!children.length) {
+                return Promise.resolve();
+            }
+            this.currentActive = activeKey;
+            const stack = [];
+            if (currentActive !== activeKey && children[currentActive]) {
+                stack.push(children[currentActive].setActive(false));
+            }
+            if (children[activeKey]) {
+                stack.push(children[activeKey].setActive(true));
+            }
+            return Promise.all(stack);
+        },
+    },
+});

wex_small/node_modules/@vant/weapp/dist/sidebar/index.json

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+{
+  "component": true
+}

wex_small/node_modules/@vant/weapp/dist/sidebar/index.wxml

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+<view class="van-sidebar custom-class">
+  <slot />
+</view>

wex_small/node_modules/@vant/weapp/dist/sidebar/index.wxss

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+@import '../common/index.wxss';.van-sidebar{width:var(--sidebar-width,80px)}