vant

utils/dist/tabbar/index.d.ts

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+export {};

utils/dist/tabbar/index.js

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+import { VantComponent } from '../common/component';
+VantComponent({
+    relation: {
+        name: 'tabbar-item',
+        type: 'descendant',
+        linked(target) {
+            this.children.push(target);
+            target.parent = this;
+            target.updateFromParent();
+        },
+        unlinked(target) {
+            this.children = this.children.filter((item) => item !== target);
+            this.updateChildren();
+        }
+    },
+    props: {
+        active: {
+            type: null,
+            observer: 'updateChildren'
+        },
+        activeColor: {
+            type: String,
+            observer: 'updateChildren'
+        },
+        inactiveColor: {
+            type: String,
+            observer: 'updateChildren'
+        },
+        fixed: {
+            type: Boolean,
+            value: true
+        },
+        border: {
+            type: Boolean,
+            value: true
+        },
+        zIndex: {
+            type: Number,
+            value: 1
+        },
+        safeAreaInsetBottom: {
+            type: Boolean,
+            value: true
+        }
+    },
+    beforeCreate() {
+        this.children = [];
+    },
+    methods: {
+        updateChildren() {
+            const { children } = this;
+            if (!Array.isArray(children) || !children.length) {
+                return Promise.resolve();
+            }
+            return Promise.all(children.map((child) => child.updateFromParent()));
+        },
+        onChange(child) {
+            const index = this.children.indexOf(child);
+            const active = child.data.name || index;
+            if (active !== this.data.active) {
+                this.$emit('change', active);
+            }
+        }
+    }
+});

utils/dist/tabbar/index.json

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+{
+  "component": true
+}

utils/dist/tabbar/index.wxml

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+<wxs src="../wxs/utils.wxs" module="utils" />
+
+<view
+  class="custom-class {{ border ? 'van-hairline--top-bottom' : '' }} {{ utils.bem('tabbar', { fixed, safe: safeAreaInsetBottom }) }}"
+  style="{{ zIndex ? 'z-index: ' + zIndex : '' }}"
+>
+  <slot />
+</view>

utils/dist/tabbar/index.wxss

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+@import '../common/index.wxss';.van-tabbar{display:-webkit-flex;display:flex;width:100%;height:50px;height:var(--tabbar-height,50px);background-color:#fff;background-color:var(--tabbar-background-color,#fff)}.van-tabbar--fixed{position:fixed;bottom:0;left:0}.van-tabbar--safe{padding-bottom:env(safe-area-inset-bottom)}