docs: about closestNode

Author: phphe

packages/docs-site/docs/en/v2/api.md

@@ -789,6 +789,10 @@ Draggable component instance. The tree drag start at.
 
 Draggable component instance. Drag target tree.
 
+#### closestNode
+
+Type: [Stat](#Stat)|null. The closest node in dragging. You can use it in [eachDroppable](#eachdroppable).
+
 #### Example - dragContext
 
 Use the dragContext to obtain the dragNode in [eachDroppable](#eachdroppable) and achieve the following effect: odd nodes only accept odd nodes, even nodes only accept even nodes.

packages/docs-site/docs/zh/v2/api.md

@@ -788,6 +788,10 @@ Draggable 组件实例. 拖拽的起始树.
 
 Draggable 组件实例. 拖拽的目标树.
 
+#### closestNode
+
+类型: [Stat](#Stat)|null. 拖拽时最近的节点.可以在 [eachDroppable](#eachdroppable) 中使用.
+
 #### Example - dragContext
 
 在[eachDroppable](#eachdroppable)中通过 dragContext 获取 dragNode，达成效果：奇数节点只接收奇数节点，偶数节点只接收偶数节点。