提交初始版本，使用vant ui库

miniprogram_npm/@vant/weapp/cascader/index.d.ts

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+export {};

miniprogram_npm/@vant/weapp/cascader/index.js

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+"use strict";
+var __spreadArray = (this && this.__spreadArray) || function (to, from, pack) {
+    if (pack || arguments.length === 2) for (var i = 0, l = from.length, ar; i < l; i++) {
+        if (ar || !(i in from)) {
+            if (!ar) ar = Array.prototype.slice.call(from, 0, i);
+            ar[i] = from[i];
+        }
+    }
+    return to.concat(ar || Array.prototype.slice.call(from));
+};
+Object.defineProperty(exports, "__esModule", { value: true });
+var component_1 = require("../common/component");
+var FieldName;
+(function (FieldName) {
+    FieldName["TEXT"] = "text";
+    FieldName["VALUE"] = "value";
+    FieldName["CHILDREN"] = "children";
+})(FieldName || (FieldName = {}));
+var defaultFieldNames = {
+    text: FieldName.TEXT,
+    value: FieldName.VALUE,
+    children: FieldName.CHILDREN,
+};
+(0, component_1.VantComponent)({
+    props: {
+        title: String,
+        value: {
+            type: String,
+        },
+        placeholder: {
+            type: String,
+            value: '请选择',
+        },
+        activeColor: {
+            type: String,
+            value: '#1989fa',
+        },
+        options: {
+            type: Array,
+            value: [],
+        },
+        swipeable: {
+            type: Boolean,
+            value: false,
+        },
+        closeable: {
+            type: Boolean,
+            value: true,
+        },
+        showHeader: {
+            type: Boolean,
+            value: true,
+        },
+        closeIcon: {
+            type: String,
+            value: 'cross',
+        },
+        fieldNames: {
+            type: Object,
+            value: defaultFieldNames,
+            observer: 'updateFieldNames',
+        },
+        useTitleSlot: Boolean,
+    },
+    data: {
+        tabs: [],
+        activeTab: 0,
+        textKey: FieldName.TEXT,
+        valueKey: FieldName.VALUE,
+        childrenKey: FieldName.CHILDREN,
+        innerValue: '',
+    },
+    watch: {
+        options: function () {
+            this.updateTabs();
+        },
+        value: function (newVal) {
+            this.updateValue(newVal);
+        },
+    },
+    created: function () {
+        this.updateTabs();
+    },
+    methods: {
+        updateValue: function (val) {
+            var _this = this;
+            if (val !== undefined) {
+                var values = this.data.tabs.map(function (tab) { return tab.selected && tab.selected[_this.data.valueKey]; });
+                if (values.indexOf(val) > -1) {
+                    return;
+                }
+            }
+            this.innerValue = val;
+            this.updateTabs();
+        },
+        updateFieldNames: function () {
+            var _a = this.data.fieldNames || defaultFieldNames, _b = _a.text, text = _b === void 0 ? 'text' : _b, _c = _a.value, value = _c === void 0 ? 'value' : _c, _d = _a.children, children = _d === void 0 ? 'children' : _d;
+            this.setData({
+                textKey: text,
+                valueKey: value,
+                childrenKey: children,
+            });
+        },
+        getSelectedOptionsByValue: function (options, value) {
+            for (var i = 0; i < options.length; i++) {
+                var option = options[i];
+                if (option[this.data.valueKey] === value) {
+                    return [option];
+                }
+                if (option[this.data.childrenKey]) {
+                    var selectedOptions = this.getSelectedOptionsByValue(option[this.data.childrenKey], value);
+                    if (selectedOptions) {
+                        return __spreadArray([option], selectedOptions, true);
+                    }
+                }
+            }
+        },
+        updateTabs: function () {
+            var _this = this;
+            var options = this.data.options;
+            var innerValue = this.innerValue;
+            if (!options.length) {
+                return;
+            }
+            if (innerValue !== undefined) {
+                var selectedOptions = this.getSelectedOptionsByValue(options, innerValue);
+                if (selectedOptions) {
+                    var optionsCursor_1 = options;
+                    var tabs_1 = selectedOptions.map(function (option) {
+                        var tab = {
+                            options: optionsCursor_1,
+                            selected: option,
+                        };
+                        var next = optionsCursor_1.find(function (item) { return item[_this.data.valueKey] === option[_this.data.valueKey]; });
+                        if (next) {
+                            optionsCursor_1 = next[_this.data.childrenKey];
+                        }
+                        return tab;
+                    });
+                    if (optionsCursor_1) {
+                        tabs_1.push({
+                            options: optionsCursor_1,
+                            selected: null,
+                        });
+                    }
+                    this.setData({
+                        tabs: tabs_1,
+                    });
+                    wx.nextTick(function () {
+                        _this.setData({
+                            activeTab: tabs_1.length - 1,
+                        });
+                    });
+                    return;
+                }
+            }
+            this.setData({
+                tabs: [
+                    {
+                        options: options,
+                        selected: null,
+                    },
+                ],
+            });
+        },
+        onClose: function () {
+            this.$emit('close');
+        },
+        onClickTab: function (e) {
+            var _a = e.detail, tabIndex = _a.index, title = _a.title;
+            this.$emit('click-tab', { title: title, tabIndex: tabIndex });
+            this.setData({
+                activeTab: tabIndex,
+            });
+        },
+        // 选中
+        onSelect: function (e) {
+            var _this = this;
+            var _a = e.currentTarget.dataset, option = _a.option, tabIndex = _a.tabIndex;
+            if (option && option.disabled) {
+                return;
+            }
+            var _b = this.data, valueKey = _b.valueKey, childrenKey = _b.childrenKey;
+            var tabs = this.data.tabs;
+            tabs[tabIndex].selected = option;
+            if (tabs.length > tabIndex + 1) {
+                tabs = tabs.slice(0, tabIndex + 1);
+            }
+            if (option[childrenKey]) {
+                var nextTab = {
+                    options: option[childrenKey],
+                    selected: null,
+                };
+                if (tabs[tabIndex + 1]) {
+                    tabs[tabIndex + 1] = nextTab;
+                }
+                else {
+                    tabs.push(nextTab);
+                }
+                wx.nextTick(function () {
+                    _this.setData({
+                        activeTab: tabIndex + 1,
+                    });
+                });
+            }
+            this.setData({
+                tabs: tabs,
+            });
+            var selectedOptions = tabs.map(function (tab) { return tab.selected; }).filter(Boolean);
+            var value = option[valueKey];
+            var params = {
+                value: value,
+                tabIndex: tabIndex,
+                selectedOptions: selectedOptions,
+            };
+            this.innerValue = value;
+            this.$emit('change', params);
+            if (!option[childrenKey]) {
+                this.$emit('finish', params);
+            }
+        },
+    },
+});

miniprogram_npm/@vant/weapp/cascader/index.json

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+{
+  "component": true,
+  "usingComponents": {
+    "van-icon": "../icon/index",
+    "van-tab":  "../tab/index",
+    "van-tabs": "../tabs/index"
+  }
+}

miniprogram_npm/@vant/weapp/cascader/index.wxml

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+<wxs src="./index.wxs" module="utils" />
+
+<view wx:if="{{ showHeader }}" class="van-cascader__header">
+  <slot name="title" wx:if="{{ useTitleSlot }}"></slot>
+  <text class="van-cascader__title" wx:else>{{ title }}</text>
+  <van-icon
+    wx:if="{{ closeable }}"
+    name="{{ closeIcon }}"
+    class="van-cascader__close-icon"
+    bind:tap="onClose"
+  />
+</view>
+
+<van-tabs
+  active="{{ activeTab }}"
+  custom-class="van-cascader__tabs"
+  wrap-class="van-cascader__tabs-wrap"
+  tab-class="van-cascader__tab"
+  color="{{ activeColor }}"
+  border="{{ false }}"
+  swipeable="{{ swipeable }}"
+  bind:click="onClickTab"
+>
+  <van-tab
+    wx:for="{{ tabs }}"
+    wx:for-item="tab"
+    wx:for-index="tabIndex"
+    wx:key="tabIndex"
+    title="{{ tab.selected ? tab.selected[textKey] : placeholder }}"
+    style="width: 100%;"
+    title-style="{{ !tab.selected ? 'color: #969799;font-weight:normal;' : '' }}"
+  >
+    <!-- 暂不支持 -->
+    <!-- <slot name="options-top"></slot> -->
+
+    <view class="van-cascader__options">
+      <view
+        wx:for="{{ tab.options }}"
+        wx:for-item="option"
+        wx:key="index"
+        class="{{ option.className }} {{ utils.optionClass(tab, valueKey, option) }}"
+        style="{{ utils.optionStyle({ tab, valueKey, option, activeColor }) }}"
+        data-option="{{ option }}"
+        data-tab-index="{{ tabIndex }}"
+        bind:tap="onSelect"
+      >
+        <text>{{ option[textKey] }}</text>
+        <van-icon wx:if="{{ utils.isSelected(tab, valueKey, option) }}" name="success" size="18" />
+      </view>
+    </view>
+    <!-- 暂不支持 -->
+    <!-- <slot name="options-bottom"></slot> -->
+  </van-tab>
+</van-tabs>

miniprogram_npm/@vant/weapp/cascader/index.wxs

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+var utils = require('../wxs/utils.wxs');
+var style = require('../wxs/style.wxs');
+
+function isSelected(tab, valueKey, option) {
+  return tab.selected && tab.selected[valueKey] === option[valueKey]
+}
+
+function optionClass(tab, valueKey, option) {
+  return utils.bem('cascader__option', { selected: isSelected(tab, valueKey, option), disabled: option.disabled })
+}
+
+function optionStyle(data) {
+  var color = data.option.color || (isSelected(data.tab, data.valueKey, data.option) ? data.activeColor : undefined);
+  return style({
+    color
+  });
+}
+
+
+module.exports = {
+  isSelected: isSelected,
+  optionClass: optionClass,
+  optionStyle: optionStyle,
+};

miniprogram_npm/@vant/weapp/cascader/index.wxss

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+@import '../common/index.wxss';.van-cascader__header{align-items:center;display:flex;height:48px;justify-content:space-between;padding:0 16px}.van-cascader__title{font-size:16px;font-weight:600;line-height:20px}.van-cascader__close-icon{color:#c8c9cc;font-size:22px;height:22px}.van-cascader__tabs-wrap{height:48px!important;padding:0 8px}.van-cascader__tab{color:#323233!important;flex:none!important;font-weight:600!important;padding:0 8px!important}.van-cascader__tab--unselected{color:#969799!important;font-weight:400!important}.van-cascader__option{align-items:center;cursor:pointer;display:flex;font-size:14px;justify-content:space-between;line-height:20px;padding:10px 16px}.van-cascader__option:active{background-color:#f2f3f5}.van-cascader__option--selected{color:#1989fa;font-weight:600}.van-cascader__option--disabled{color:#c8c9cc;cursor:not-allowed}.van-cascader__option--disabled:active{background-color:initial}.van-cascader__options{-webkit-overflow-scrolling:touch;box-sizing:border-box;height:384px;overflow-y:auto;padding-top:6px}