[Doc] update vant-demo respo (#318)

* fix: Tabbar icon line-height

* [new feature] progress add showPivot prop

* [new feature] TabItem support vue-router

* [new feature] update document header style

* [Doc] add toast english ducoment

* [bugfix] Search box-sizing wrong

* [Doc] update vant-demo respo

docs/src/components/MobileNav.vue

@@ -0,0 +1,141 @@
+<template>
+  <div class="mobile-nav-group">
+    <div
+      class="mobile-nav-group__title mobile-nav-group__basetitle"
+      :class="{
+        'mobile-nav-group__title--open': isOpen
+      }"
+      @click="handleNavTitleClick">
+      {{group.groupName}}
+    </div>
+    <div class="mobile-nav-group__list-wrapper" :class="{ 'mobile-nav-group__list-wrapper--open': isOpen }">
+      <ul class="mobile-nav-group__list" :class="{ 'mobile-nav-group__list--open': isOpen }">
+        <template v-for="(navItem, index) in group.list">
+          <li
+            :key="index"
+            class="mobile-nav-group__title"
+            v-if="!navItem.disabled">
+            <router-link
+              active-class="active"
+              :to="'/' + base + navItem.path">
+              <p>
+                {{ navItem.title }}
+              </p>
+            </router-link>
+            <van-icon name="arrow"></van-icon>
+          </li>
+        </template>
+      </ul>
+    </div>
+  </div>
+</template>
+
+<script>
+export default {
+  props: {
+    group: {
+      type: Object,
+      default: () => {
+        return [];
+      }
+    },
+    base: String,
+    navKey: [String, Number]
+  },
+
+  data() {
+    return {
+      isOpen: false
+    };
+  },
+
+  mounted() {
+    this.isOpen = JSON.parse(sessionStorage.getItem('mobile-nav-' + this.navKey));
+  },
+
+  methods: {
+    handleNavTitleClick() {
+      this.isOpen = !this.isOpen;
+      sessionStorage.setItem('mobile-nav-' + this.navKey, this.isOpen);
+    }
+  }
+};
+</script>
+
+<style lang="postcss">
+.mobile-nav-group {
+  border-radius: 2px;
+  margin-bottom: 15px;
+  background-color: #fff;
+  box-shadow: 0 1px 1px 0 rgba(0,0,0,0.10);
+
+  &__basetitle {
+    padding-left: 20px;
+  }
+
+  &__title {
+    font-size: 16px;
+    color: #333;
+    line-height: 56px;
+    position: relative;
+    user-select: none;
+
+    &--open {
+      color: #999;
+    }
+
+    a {
+      color: #333;
+      display: block;
+      user-select: none;
+      padding-left: 20px;
+      -webkit-tap-highlight-color: rgba(0, 0, 0, 0);
+
+      &:active {
+        background: #ECECEC;
+      }
+
+      > p {
+        margin: 0;
+        border-top: 1px solid #e5e5e5;
+      }
+    }
+
+    .van-icon-arrow {
+      position: absolute;
+      font-size: 12px;
+      line-height: 1;
+      top: 24px;
+      right: 20px;
+    }
+  }
+
+  &__list-wrapper {
+    height: 0;
+    overflow: hidden;
+
+    &--open {
+      height: auto;
+    }
+  }
+
+  &__list {
+    transform: translateY(-50%);
+    transition: transform .2s ease-out;
+
+    &--open {
+      transform: translateY(0);
+    }
+  }
+
+  li {
+    list-style: none;
+  }
+
+  ul {
+    padding: 0;
+    margin: 0;
+    overflow: hidden;
+  }
+}
+</style>