提交初始版本，使用vant ui库

miniprogram_npm/@vant/weapp/tree-select/index.js

@@ -0,0 +1,70 @@
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+var component_1 = require("../common/component");
+(0, component_1.VantComponent)({
+    classes: [
+        'main-item-class',
+        'content-item-class',
+        'main-active-class',
+        'content-active-class',
+        'main-disabled-class',
+        'content-disabled-class',
+    ],
+    props: {
+        items: {
+            type: Array,
+            observer: 'updateSubItems',
+        },
+        activeId: null,
+        mainActiveIndex: {
+            type: Number,
+            value: 0,
+            observer: 'updateSubItems',
+        },
+        height: {
+            type: null,
+            value: 300,
+        },
+        max: {
+            type: Number,
+            value: Infinity,
+        },
+        selectedIcon: {
+            type: String,
+            value: 'success',
+        },
+    },
+    data: {
+        subItems: [],
+    },
+    methods: {
+        // 当一个子项被选择时
+        onSelectItem: function (event) {
+            var item = event.currentTarget.dataset.item;
+            var isArray = Array.isArray(this.data.activeId);
+            // 判断有没有超出右侧选择的最大数
+            var isOverMax = isArray && this.data.activeId.length >= this.data.max;
+            // 判断该项有没有被选中, 如果有被选中，则忽视是否超出的条件
+            var isSelected = isArray
+                ? this.data.activeId.indexOf(item.id) > -1
+                : this.data.activeId === item.id;
+            if (!item.disabled && (!isOverMax || isSelected)) {
+                this.$emit('click-item', item);
+            }
+        },
+        // 当一个导航被点击时
+        onClickNav: function (event) {
+            var index = event.detail;
+            var item = this.data.items[index];
+            if (!item.disabled) {
+                this.$emit('click-nav', { index: index });
+            }
+        },
+        // 更新子项列表
+        updateSubItems: function () {
+            var _a = this.data, items = _a.items, mainActiveIndex = _a.mainActiveIndex;
+            var _b = (items[mainActiveIndex] || {}).children, children = _b === void 0 ? [] : _b;
+            this.setData({ subItems: children });
+        },
+    },
+});