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node_modules/vant/es/dropdown-menu/index.css

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+.van-dropdown-menu{-webkit-user-select:none;user-select:none}.van-dropdown-menu__bar{position:relative;display:-webkit-box;display:-webkit-flex;display:flex;height:48px;background-color:#fff;box-shadow:0 2px 12px rgba(100,101,102,.12)}.van-dropdown-menu__bar--opened{z-index:11}.van-dropdown-menu__item{display:-webkit-box;display:-webkit-flex;display:flex;-webkit-box-flex:1;-webkit-flex:1;flex:1;-webkit-box-align:center;-webkit-align-items:center;align-items:center;-webkit-box-pack:center;-webkit-justify-content:center;justify-content:center;min-width:0;cursor:pointer}.van-dropdown-menu__item:active{opacity:.7}.van-dropdown-menu__item--disabled:active{opacity:1}.van-dropdown-menu__item--disabled .van-dropdown-menu__title{color:#969799}.van-dropdown-menu__title{position:relative;box-sizing:border-box;max-width:100%;padding:0 8px;color:#323233;font-size:15px;line-height:22px}.van-dropdown-menu__title::after{position:absolute;top:50%;right:-4px;margin-top:-5px;border:3px solid;border-color:transparent transparent #dcdee0 #dcdee0;-webkit-transform:rotate(-45deg);transform:rotate(-45deg);opacity:.8;content:''}.van-dropdown-menu__title--active{color:#ee0a24}.van-dropdown-menu__title--active::after{border-color:transparent transparent currentColor currentColor}.van-dropdown-menu__title--down::after{margin-top:-1px;-webkit-transform:rotate(135deg);transform:rotate(135deg)}

node_modules/vant/es/dropdown-menu/index.js

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+// Utils
+import { createNamespace, isDef } from '../utils';
+import { getScroller } from '../utils/dom/scroll'; // Mixins
+
+import { ParentMixin } from '../mixins/relation';
+import { ClickOutsideMixin } from '../mixins/click-outside';
+
+var _createNamespace = createNamespace('dropdown-menu'),
+    createComponent = _createNamespace[0],
+    bem = _createNamespace[1];
+
+export default createComponent({
+  mixins: [ParentMixin('vanDropdownMenu'), ClickOutsideMixin({
+    event: 'click',
+    method: 'onClickOutside'
+  })],
+  props: {
+    zIndex: [Number, String],
+    activeColor: String,
+    overlay: {
+      type: Boolean,
+      default: true
+    },
+    duration: {
+      type: [Number, String],
+      default: 0.2
+    },
+    direction: {
+      type: String,
+      default: 'down'
+    },
+    closeOnClickOverlay: {
+      type: Boolean,
+      default: true
+    }
+  },
+  data: function data() {
+    return {
+      offset: 0
+    };
+  },
+  computed: {
+    scroller: function scroller() {
+      return getScroller(this.$el);
+    },
+    opened: function opened() {
+      return this.children.some(function (item) {
+        return item.showWrapper;
+      });
+    },
+    barStyle: function barStyle() {
+      if (this.opened && isDef(this.zIndex)) {
+        return {
+          zIndex: 1 + this.zIndex
+        };
+      }
+    }
+  },
+  methods: {
+    updateOffset: function updateOffset() {
+      if (!this.$refs.bar) {
+        return;
+      }
+
+      var rect = this.$refs.bar.getBoundingClientRect();
+
+      if (this.direction === 'down') {
+        this.offset = rect.bottom;
+      } else {
+        this.offset = window.innerHeight - rect.top;
+      }
+    },
+    toggleItem: function toggleItem(active) {
+      this.children.forEach(function (item, index) {
+        if (index === active) {
+          item.toggle();
+        } else if (item.showPopup) {
+          item.toggle(false, {
+            immediate: true
+          });
+        }
+      });
+    },
+    onClickOutside: function onClickOutside() {
+      this.children.forEach(function (item) {
+        item.toggle(false);
+      });
+    }
+  },
+  render: function render() {
+    var _this = this;
+
+    var h = arguments[0];
+    var Titles = this.children.map(function (item, index) {
+      return h("div", {
+        "attrs": {
+          "role": "button",
+          "tabindex": item.disabled ? -1 : 0
+        },
+        "class": bem('item', {
+          disabled: item.disabled
+        }),
+        "on": {
+          "click": function click() {
+            if (!item.disabled) {
+              _this.toggleItem(index);
+            }
+          }
+        }
+      }, [h("span", {
+        "class": [bem('title', {
+          active: item.showPopup,
+          down: item.showPopup === (_this.direction === 'down')
+        }), item.titleClass],
+        "style": {
+          color: item.showPopup ? _this.activeColor : ''
+        }
+      }, [h("div", {
+        "class": "van-ellipsis"
+      }, [item.slots('title') || item.displayTitle])])]);
+    });
+    return h("div", {
+      "class": bem()
+    }, [h("div", {
+      "ref": "bar",
+      "style": this.barStyle,
+      "class": bem('bar', {
+        opened: this.opened
+      })
+    }, [Titles]), this.slots('default')]);
+  }
+});

node_modules/vant/es/dropdown-menu/index.less

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+@import '../style/var';
+
+.van-dropdown-menu {
+  user-select: none;
+
+  &__bar {
+    position: relative;
+    display: flex;
+    height: @dropdown-menu-height;
+    background-color: @dropdown-menu-background-color;
+    box-shadow: @dropdown-menu-box-shadow;
+
+    &--opened {
+      z-index: @dropdown-item-z-index + 1;
+    }
+  }
+
+  &__item {
+    display: flex;
+    flex: 1;
+    align-items: center;
+    justify-content: center;
+    min-width: 0; // hack for flex ellipsis
+    cursor: pointer;
+
+    &:active {
+      opacity: @active-opacity;
+    }
+
+    &--disabled {
+      &:active {
+        opacity: 1;
+      }
+
+      .van-dropdown-menu__title {
+        color: @dropdown-menu-title-disabled-text-color;
+      }
+    }
+  }
+
+  &__title {
+    position: relative;
+    box-sizing: border-box;
+    max-width: 100%;
+    padding: @dropdown-menu-title-padding;
+    color: @dropdown-menu-title-text-color;
+    font-size: @dropdown-menu-title-font-size;
+    line-height: @dropdown-menu-title-line-height;
+
+    &::after {
+      position: absolute;
+      top: 50%;
+      right: -4px;
+      margin-top: -5px;
+      border: 3px solid;
+      border-color: transparent transparent @gray-4 @gray-4;
+      transform: rotate(-45deg);
+      opacity: 0.8;
+      content: '';
+    }
+
+    &--active {
+      color: @dropdown-menu-title-active-text-color;
+
+      &::after {
+        border-color: transparent transparent currentColor currentColor;
+      }
+    }
+
+    &--down {
+      &::after {
+        margin-top: -1px;
+        transform: rotate(135deg);
+      }
+    }
+  }
+}

node_modules/vant/es/dropdown-menu/style/index.js

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+import '../../style/base.css';
+import '../index.css';

node_modules/vant/es/dropdown-menu/style/less.js

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+import '../../style/base.less';
+import '../index.less';