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node_modules/vant/es/cascader/index.css

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+.van-cascader__header{display:-webkit-box;display:-webkit-flex;display:flex;-webkit-box-align:center;-webkit-align-items:center;align-items:center;-webkit-box-pack:justify;-webkit-justify-content:space-between;justify-content:space-between;height:48px;padding:0 16px}.van-cascader__title{font-weight:500;font-size:16px;line-height:20px}.van-cascader__close-icon{color:#c8c9cc;font-size:22px}.van-cascader__close-icon:active{color:#969799}.van-cascader__tabs .van-tab{-webkit-box-flex:0;-webkit-flex:none;flex:none;padding:0 10px}.van-cascader__tabs.van-tabs--line .van-tabs__wrap{height:48px}.van-cascader__tabs .van-tabs__nav--complete{padding-right:6px;padding-left:6px}.van-cascader__tab{color:#323233;font-weight:500}.van-cascader__tab--unselected{color:#969799;font-weight:400}.van-cascader__option{display:-webkit-box;display:-webkit-flex;display:flex;-webkit-box-align:center;-webkit-align-items:center;align-items:center;-webkit-box-pack:justify;-webkit-justify-content:space-between;justify-content:space-between;padding:10px 16px;font-size:14px;line-height:20px}.van-cascader__option:active{background-color:#f2f3f5}.van-cascader__option--selected{color:#ee0a24;font-weight:500}.van-cascader__selected-icon{font-size:18px}.van-cascader__options{box-sizing:border-box;height:384px;padding-top:6px;overflow-y:auto;-webkit-overflow-scrolling:touch}

node_modules/vant/es/cascader/index.js

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+import { createNamespace } from '../utils';
+import Tab from '../tab';
+import Tabs from '../tabs';
+import Icon from '../icon';
+
+var _createNamespace = createNamespace('cascader'),
+    createComponent = _createNamespace[0],
+    bem = _createNamespace[1],
+    t = _createNamespace[2];
+
+export default createComponent({
+  props: {
+    title: String,
+    value: [Number, String],
+    fieldNames: Object,
+    placeholder: String,
+    activeColor: String,
+    options: {
+      type: Array,
+      default: function _default() {
+        return [];
+      }
+    },
+    closeable: {
+      type: Boolean,
+      default: true
+    },
+    showHeader: {
+      type: Boolean,
+      default: true
+    }
+  },
+  data: function data() {
+    return {
+      tabs: [],
+      activeTab: 0
+    };
+  },
+  computed: {
+    textKey: function textKey() {
+      var _this$fieldNames;
+
+      return ((_this$fieldNames = this.fieldNames) == null ? void 0 : _this$fieldNames.text) || 'text';
+    },
+    valueKey: function valueKey() {
+      var _this$fieldNames2;
+
+      return ((_this$fieldNames2 = this.fieldNames) == null ? void 0 : _this$fieldNames2.value) || 'value';
+    },
+    childrenKey: function childrenKey() {
+      var _this$fieldNames3;
+
+      return ((_this$fieldNames3 = this.fieldNames) == null ? void 0 : _this$fieldNames3.children) || 'children';
+    }
+  },
+  watch: {
+    options: {
+      deep: true,
+      handler: 'updateTabs'
+    },
+    value: function value(_value) {
+      var _this = this;
+
+      if (_value || _value === 0) {
+        var values = this.tabs.map(function (tab) {
+          var _tab$selectedOption;
+
+          return (_tab$selectedOption = tab.selectedOption) == null ? void 0 : _tab$selectedOption[_this.valueKey];
+        });
+
+        if (values.indexOf(_value) !== -1) {
+          return;
+        }
+      }
+
+      this.updateTabs();
+    }
+  },
+  created: function created() {
+    this.updateTabs();
+  },
+  methods: {
+    getSelectedOptionsByValue: function getSelectedOptionsByValue(options, value) {
+      for (var i = 0; i < options.length; i++) {
+        var option = options[i];
+
+        if (option[this.valueKey] === value) {
+          return [option];
+        }
+
+        if (option[this.childrenKey]) {
+          var selectedOptions = this.getSelectedOptionsByValue(option[this.childrenKey], value);
+
+          if (selectedOptions) {
+            return [option].concat(selectedOptions);
+          }
+        }
+      }
+    },
+    updateTabs: function updateTabs() {
+      var _this2 = this;
+
+      if (this.value || this.value === 0) {
+        var selectedOptions = this.getSelectedOptionsByValue(this.options, this.value);
+
+        if (selectedOptions) {
+          var optionsCursor = this.options;
+          this.tabs = selectedOptions.map(function (option) {
+            var tab = {
+              options: optionsCursor,
+              selectedOption: option
+            };
+            var next = optionsCursor.filter(function (item) {
+              return item[_this2.valueKey] === option[_this2.valueKey];
+            });
+
+            if (next.length) {
+              optionsCursor = next[0][_this2.childrenKey];
+            }
+
+            return tab;
+          });
+
+          if (optionsCursor) {
+            this.tabs.push({
+              options: optionsCursor,
+              selectedOption: null
+            });
+          }
+
+          this.$nextTick(function () {
+            _this2.activeTab = _this2.tabs.length - 1;
+          });
+          return;
+        }
+      }
+
+      this.tabs = [{
+        options: this.options,
+        selectedOption: null
+      }];
+    },
+    onSelect: function onSelect(option, tabIndex) {
+      var _this3 = this;
+
+      this.tabs[tabIndex].selectedOption = option;
+
+      if (this.tabs.length > tabIndex + 1) {
+        this.tabs = this.tabs.slice(0, tabIndex + 1);
+      }
+
+      if (option[this.childrenKey]) {
+        var nextTab = {
+          options: option[this.childrenKey],
+          selectedOption: null
+        };
+
+        if (this.tabs[tabIndex + 1]) {
+          this.$set(this.tabs, tabIndex + 1, nextTab);
+        } else {
+          this.tabs.push(nextTab);
+        }
+
+        this.$nextTick(function () {
+          _this3.activeTab++;
+        });
+      }
+
+      var selectedOptions = this.tabs.map(function (tab) {
+        return tab.selectedOption;
+      }).filter(function (item) {
+        return !!item;
+      });
+      var eventParams = {
+        value: option[this.valueKey],
+        tabIndex: tabIndex,
+        selectedOptions: selectedOptions
+      };
+      this.$emit('input', option[this.valueKey]);
+      this.$emit('change', eventParams);
+
+      if (!option[this.childrenKey]) {
+        this.$emit('finish', eventParams);
+      }
+    },
+    onClose: function onClose() {
+      this.$emit('close');
+    },
+    renderHeader: function renderHeader() {
+      var h = this.$createElement;
+
+      if (this.showHeader) {
+        return h("div", {
+          "class": bem('header')
+        }, [h("h2", {
+          "class": bem('title')
+        }, [this.slots('title') || this.title]), this.closeable ? h(Icon, {
+          "attrs": {
+            "name": "cross"
+          },
+          "class": bem('close-icon'),
+          "on": {
+            "click": this.onClose
+          }
+        }) : null]);
+      }
+    },
+    renderOptions: function renderOptions(options, selectedOption, tabIndex) {
+      var _this4 = this;
+
+      var h = this.$createElement;
+
+      var renderOption = function renderOption(option) {
+        var isSelected = selectedOption && option[_this4.valueKey] === selectedOption[_this4.valueKey];
+        var Text = _this4.slots('option', {
+          option: option,
+          selected: isSelected
+        }) || h("span", [option[_this4.textKey]]);
+        return h("li", {
+          "class": bem('option', {
+            selected: isSelected
+          }),
+          "style": {
+            color: isSelected ? _this4.activeColor : null
+          },
+          "on": {
+            "click": function click() {
+              _this4.onSelect(option, tabIndex);
+            }
+          }
+        }, [Text, isSelected ? h(Icon, {
+          "attrs": {
+            "name": "success"
+          },
+          "class": bem('selected-icon')
+        }) : null]);
+      };
+
+      return h("ul", {
+        "class": bem('options')
+      }, [options.map(renderOption)]);
+    },
+    renderTab: function renderTab(item, tabIndex) {
+      var h = this.$createElement;
+      var options = item.options,
+          selectedOption = item.selectedOption;
+      var title = selectedOption ? selectedOption[this.textKey] : this.placeholder || t('select');
+      return h(Tab, {
+        "attrs": {
+          "title": title,
+          "titleClass": bem('tab', {
+            unselected: !selectedOption
+          })
+        }
+      }, [this.renderOptions(options, selectedOption, tabIndex)]);
+    },
+    renderTabs: function renderTabs() {
+      var _this5 = this;
+
+      var h = this.$createElement;
+      return h(Tabs, {
+        "attrs": {
+          "animated": true,
+          "swipeable": true,
+          "swipeThreshold": 0,
+          "color": this.activeColor
+        },
+        "class": bem('tabs'),
+        "model": {
+          value: _this5.activeTab,
+          callback: function callback($$v) {
+            _this5.activeTab = $$v;
+          }
+        }
+      }, [this.tabs.map(this.renderTab)]);
+    }
+  },
+  render: function render() {
+    var h = arguments[0];
+    return h("div", {
+      "class": bem()
+    }, [this.renderHeader(), this.renderTabs()]);
+  }
+});

node_modules/vant/es/cascader/index.less

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+@import '../style/var';
+
+.van-cascader {
+  &__header {
+    display: flex;
+    align-items: center;
+    justify-content: space-between;
+    height: @cascader-header-height;
+    padding: 0 @padding-md;
+  }
+
+  &__title {
+    font-weight: @font-weight-bold;
+    font-size: @cascader-title-font-size;
+    line-height: @cascader-title-line-height;
+  }
+
+  &__close-icon {
+    color: @cascader-close-icon-color;
+    font-size: @cascader-close-icon-size;
+
+    &:active {
+      color: @cascader-close-icon-active-color;
+    }
+  }
+
+  &__tabs {
+    .van-tab {
+      flex: none;
+      padding: 0 10px;
+    }
+
+    &.van-tabs--line .van-tabs__wrap {
+      height: @cascader-tabs-height;
+    }
+
+    .van-tabs__nav--complete {
+      padding-right: 6px;
+      padding-left: 6px;
+    }
+  }
+
+  &__tab {
+    color: @cascader-tab-color;
+    font-weight: @font-weight-bold;
+
+    &--unselected {
+      color: @cascader-unselected-tab-color;
+      font-weight: normal;
+    }
+  }
+
+  &__option {
+    display: flex;
+    align-items: center;
+    justify-content: space-between;
+    padding: 10px @padding-md;
+    font-size: @font-size-md;
+    line-height: @line-height-md;
+
+    &:active {
+      background-color: @active-color;
+    }
+
+    &--selected {
+      color: @cascader-active-color;
+      font-weight: @font-weight-bold;
+    }
+  }
+
+  &__selected-icon {
+    font-size: @cascader-selected-icon-size;
+  }
+
+  &__options {
+    box-sizing: border-box;
+    height: @cascader-options-height;
+    padding-top: 6px;
+    overflow-y: auto;
+    -webkit-overflow-scrolling: touch;
+  }
+}

node_modules/vant/es/cascader/style/index.js

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+import '../../style/base.css';
+import '../../info/index.css';
+import '../../icon/index.css';
+import '../../tab/index.css';
+import '../../sticky/index.css';
+import '../../tabs/index.css';
+import '../index.css';

node_modules/vant/es/cascader/style/less.js

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+import '../../style/base.less';
+import '../../info/index.less';
+import '../../icon/index.less';
+import '../../tab/index.less';
+import '../../sticky/index.less';
+import '../../tabs/index.less';
+import '../index.less';