[improvement] CellGroup: jsx (#2449)

packages/cell-group/index.js

@@ -0,0 +1,20 @@
+import createSfc from '../utils/create-basic';
+
+export default createSfc({
+  name: 'cell-group',
+
+  props: {
+    border: {
+      type: Boolean,
+      default: true
+    }
+  },
+
+  render(h) {
+    return (
+      <div class={['van-cell-group', { 'van-hairline--top-bottom': this.border }]}>
+        {this.$slots.default}
+      </div>
+    );
+  }
+});