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node_modules/vant/es/tab/index.css

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+.van-tab__pane,.van-tab__pane-wrapper{-webkit-flex-shrink:0;flex-shrink:0;box-sizing:border-box;width:100%}.van-tab__pane-wrapper--inactive{height:0;overflow:visible}

node_modules/vant/es/tab/index.js

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+import _extends from "@babel/runtime/helpers/esm/extends";
+import { createNamespace } from '../utils';
+import { ChildrenMixin } from '../mixins/relation';
+import { routeProps } from '../utils/router';
+
+var _createNamespace = createNamespace('tab'),
+    createComponent = _createNamespace[0],
+    bem = _createNamespace[1];
+
+export default createComponent({
+  mixins: [ChildrenMixin('vanTabs')],
+  props: _extends({}, routeProps, {
+    dot: Boolean,
+    name: [Number, String],
+    // @deprecated
+    info: [Number, String],
+    badge: [Number, String],
+    title: String,
+    titleStyle: null,
+    titleClass: null,
+    disabled: Boolean
+  }),
+  data: function data() {
+    return {
+      inited: false
+    };
+  },
+  computed: {
+    computedName: function computedName() {
+      var _this$name;
+
+      return (_this$name = this.name) != null ? _this$name : this.index;
+    },
+    isActive: function isActive() {
+      var active = this.computedName === this.parent.currentName;
+
+      if (active) {
+        this.inited = true;
+      }
+
+      return active;
+    }
+  },
+  watch: {
+    title: function title() {
+      this.parent.setLine();
+      this.parent.scrollIntoView();
+    },
+    inited: function inited(val) {
+      var _this = this;
+
+      if (this.parent.lazyRender && val) {
+        this.$nextTick(function () {
+          _this.parent.$emit('rendered', _this.computedName, _this.title);
+        });
+      }
+    }
+  },
+  render: function render(h) {
+    var slots = this.slots,
+        parent = this.parent,
+        isActive = this.isActive;
+    var slotContent = slots();
+
+    if (process.env.NODE_ENV === 'development' && this.info) {
+      console.warn('[Vant] Tab: "info" prop is deprecated, use "badge" prop instead.');
+    }
+
+    if (!slotContent && !parent.animated) {
+      return;
+    }
+
+    var show = parent.scrollspy || isActive;
+    var shouldRender = this.inited || parent.scrollspy || !parent.lazyRender;
+    var Content = shouldRender ? slotContent : h();
+
+    if (parent.animated) {
+      return h("div", {
+        "attrs": {
+          "role": "tabpanel",
+          "aria-hidden": !isActive
+        },
+        "class": bem('pane-wrapper', {
+          inactive: !isActive
+        })
+      }, [h("div", {
+        "class": bem('pane')
+      }, [Content])]);
+    }
+
+    return h("div", {
+      "directives": [{
+        name: "show",
+        value: show
+      }],
+      "attrs": {
+        "role": "tabpanel"
+      },
+      "class": bem('pane')
+    }, [Content]);
+  }
+});

node_modules/vant/es/tab/index.less

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+@import '../style/var';
+
+.van-tab {
+  &__pane {
+    &,
+    &-wrapper {
+      flex-shrink: 0;
+      box-sizing: border-box;
+      width: 100%;
+    }
+
+    &-wrapper--inactive {
+      height: 0;
+      overflow: visible;
+    }
+  }
+}

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

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

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

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