feat: api onTabBarMidButtonTap

docs/api/_sidebar.md

@@ -17,6 +17,7 @@
   * [设置tabbar](set-tabbar.md)
   * [页面下拉刷新](pull-down-refresh.md)
   * [将页面滚动到指定位置](page-scroll-to.md)
+  * [监听中间按钮的点击事件](on-tab-bar-mid-button-tap.md)
 * 元素节点
   * [获取element](get-element.md)
   * [获取node](nodes-info.md)

docs/api/on-tab-bar-mid-button-tap.md

+## uni.onTabBarMidButtonTap(options) @ontabbarmidbuttontap
+
+<!-- UTSAPIJSON.onTabBarMidButtonTap.description -->
+
+<!-- UTSAPIJSON.onTabBarMidButtonTap.param -->
+
+<!-- UTSAPIJSON.onTabBarMidButtonTap.returnValue -->
+
+<!-- UTSAPIJSON.onTabBarMidButtonTap.compatibility -->
+
+<!-- UTSAPIJSON.onTabBarMidButtonTap.tutorial -->
+
+<!-- UTSAPIJSON.general_type.name -->
+
+<!-- UTSAPIJSON.general_type.param -->
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