add NavBar component

packages/index.js

@@ -22,6 +22,7 @@ import Icon from './icon';
 import ImagePreview from './image-preview';
 import Lazyload from './lazyload';
 import Loading from './loading';
+import NavBar from './nav-bar';
 import NoticeBar from './notice-bar';
 import Panel from './panel';
 import Picker from './picker';
@@ -71,6 +72,7 @@ const components = [
   GoodsActionMiniBtn,
   Icon,
   Loading,
+  NavBar,
   NoticeBar,
   Panel,
   Picker,
@@ -136,6 +138,7 @@ export {
   ImagePreview,
   Lazyload,
   Loading,
+  NavBar,
   NoticeBar,
   Panel,
   Picker,

packages/nav-bar/index.vue

@@ -0,0 +1,38 @@
+<template>
+  <div :class="['van-nav-bar van-hairline--top-bottom', { 'van-nav-bar--fixed': fixed }]">
+    <div class="van-nav-bar__left" @click="$emit('clickLeft')">
+      <slot name="left">
+        <van-icon v-if="leftArrow" class="van-nav-bar__arrow" name="arrow" />
+        <span v-if="leftText" v-text="leftText" class="van-nav-bar__text" />
+      </slot>
+    </div>
+    <div class="van-nav-bar__title">
+      <slot name="title">{{ title }}</slot>
+    </div>
+    <div class="van-nav-bar__right" @click="$emit('clickRight')">
+      <slot name="right">
+        <span v-if="rightText" v-text="rightText" class="van-nav-bar__text" />
+      </slot>
+    </div>
+  </div>
+</template>
+
+<script>
+import Icon from '../icon';
+
+export default {
+  name: 'van-nav-bar',
+
+  components: {
+    [Icon.name]: Icon
+  },
+
+  props: {
+    title: String,
+    leftText: String,
+    rightText: String,
+    leftArrow: Boolean,
+    fixed: Boolean
+  }
+};
+</script>

packages/vant-css/src/index.css

@@ -15,6 +15,8 @@
 @import './card.css';
 @import './icon.css';
 @import './loading.css';
+@import './nav-bar.css';
+@import './notice-bar.css';
 @import './popup.css';
 @import './search.css';
 @import './panel.css';
@@ -48,5 +50,4 @@
 /* business components */
 @import './coupon-list.css';
 @import './goods-action.css';
-@import './notice-bar.css';
 @import './submit-bar.css';

packages/vant-css/src/nav-bar.css

@@ -0,0 +1,60 @@
+@import './common/var.css';
+
+.van-nav-bar {
+  height: 46px;
+  position: relative;
+  user-select: none;
+  text-align: center;
+  line-height: 46px;
+  background-color: #fff;
+
+  .van-icon {
+    color: $blue;
+  }
+
+  &__arrow {
+    transform: rotate(180deg);
+
+    + .van-nav-bar__text {
+      margin-left: -20px;
+      padding-left: 25px;
+    }
+  }
+
+  &--fixed {
+    top: 0;
+    left: 0;
+    width: 100%;
+    position: fixed;
+  }
+
+  &__title {
+    font-size: 16px;
+  }
+
+  &__left,
+  &__right {
+    bottom: 0;
+    font-size: 14px;
+    position: absolute;
+  }
+
+  &__left {
+    left: 15px;
+  }
+
+  &__right {
+    right: 15px;
+  }
+
+  &__text {
+    color: $blue;
+    margin: 0 -15px;
+    padding: 0 15px;
+    display: inline-block;
+
+    &:active {
+      background-color: $active-color;
+    }
+  }
+}