diff --git a/simple-mind-map/src/plugins/Select.js b/simple-mind-map/src/plugins/Select.js
index 1998d192..c26ebb58 100644
--- a/simple-mind-map/src/plugins/Select.js
+++ b/simple-mind-map/src/plugins/Select.js
@@ -1,4 +1,4 @@
-import { bfsWalk, throttle } from '../utils'
+import { bfsWalk, throttle, checkTwoRectIsOverlap } from '../utils'
 
 // 节点选择插件
 class Select {
@@ -210,24 +210,19 @@ class Select {
       left = left * scaleX + translateX
       top = top * scaleY + translateY
       if (
-        ((left >= minx && left <= maxx) || (right >= minx && right <= maxx)) &&
-        ((top >= miny && top <= maxy) || (bottom >= miny && bottom <= maxy))
+        checkTwoRectIsOverlap(minx, maxx, miny, maxy, left, right, top, bottom)
       ) {
-        // this.mindMap.batchExecution.push('activeNode' + node.uid, () => {
         if (node.nodeData.data.isActive) {
           return
         }
         this.mindMap.renderer.setNodeActive(node, true)
         this.mindMap.renderer.addActiveNode(node)
-        // })
       } else if (node.nodeData.data.isActive) {
-        // this.mindMap.batchExecution.push('activeNode' + node.uid, () => {
         if (!node.nodeData.data.isActive) {
           return
         }
         this.mindMap.renderer.setNodeActive(node, false)
         this.mindMap.renderer.removeActiveNode(node)
-        // })
       }
     })
   }
diff --git a/simple-mind-map/src/utils/index.js b/simple-mind-map/src/utils/index.js
index babbdb0e..bc13eba0 100644
--- a/simple-mind-map/src/utils/index.js
+++ b/simple-mind-map/src/utils/index.js
@@ -669,3 +669,32 @@ export const checkIsNodeStyleDataKey = key => {
   }
   return false
 }
+
+// 从节点实例列表里找出顶层的节点
+export const getTopAncestorsFomNodeList = list => {
+  let res = []
+  list.forEach(node => {
+    if (
+      !list.find(item => {
+        return item.uid !== node.uid && item.isParent(node)
+      })
+    ) {
+      res.push(node)
+    }
+  })
+  return res
+}
+
+// 判断两个矩形是否重叠
+export const checkTwoRectIsOverlap = (
+  minx1,
+  maxx1,
+  miny1,
+  maxy1,
+  minx2,
+  maxx2,
+  miny2,
+  maxy2
+) => {
+  return maxx1 > minx2 && maxx2 > minx1 && maxy1 > miny2 && maxy2 > miny1
+}