feat: NavBar component

src-next/nav-bar/test/__snapshots__/demo.spec.js.snap

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+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`renders demo correctly 1`] = `
+<div>
+  <div>
+    <div class="van-nav-bar van-hairline--bottom">
+      <div class="van-nav-bar__left"><i class="van-icon van-icon-arrow-left van-nav-bar__arrow">
+          <!----></i><span class="van-nav-bar__text">返回</span></div>
+      <div class="van-nav-bar__title van-ellipsis">标题</div>
+      <div class="van-nav-bar__right"><span class="van-nav-bar__text">按钮</span></div>
+    </div>
+  </div>
+  <div>
+    <div class="van-nav-bar van-hairline--bottom">
+      <div class="van-nav-bar__left"><i class="van-icon van-icon-arrow-left van-nav-bar__arrow">
+          <!----></i><span class="van-nav-bar__text">返回</span></div>
+      <div class="van-nav-bar__title van-ellipsis">标题</div>
+      <div class="van-nav-bar__right"><i class="van-icon van-icon-search" style="font-size: 18px;">
+          <!----></i></div>
+    </div>
+  </div>
+</div>
+`;

src-next/nav-bar/test/__snapshots__/index.spec.js.snap

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+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`placeholder prop 1`] = `
+<div class="van-nav-bar__placeholder" style="height: 50px;">
+  <div class="van-nav-bar van-nav-bar--fixed van-hairline--bottom">
+    <div class="van-nav-bar__left"></div>
+    <div class="van-nav-bar__title van-ellipsis"></div>
+    <div class="van-nav-bar__right"></div>
+  </div>
+</div>
+`;
+
+exports[`render left & right slot 1`] = `
+<div class="van-nav-bar van-hairline--bottom">
+  <div class="van-nav-bar__left">Custom Left</div>
+  <div class="van-nav-bar__title van-ellipsis"></div>
+  <div class="van-nav-bar__right">Custom Right</div>
+</div>
+`;
+
+exports[`render title slot 1`] = `
+<div class="van-nav-bar van-hairline--bottom">
+  <div class="van-nav-bar__left"></div>
+  <div class="van-nav-bar__title van-ellipsis">Custom Title</div>
+  <div class="van-nav-bar__right"></div>
+</div>
+`;