diff --git a/packages/fineui/src/core/3.ob.js b/packages/fineui/src/core/3.ob.js
index 1cf2d94ae..3e4ed7fe4 100644
--- a/packages/fineui/src/core/3.ob.js
+++ b/packages/fineui/src/core/3.ob.js
@@ -155,7 +155,7 @@ export class OB {
         eventName = eventName.toLowerCase();
 
         /* alex:如果fn是null,就是把eventName上面所有方法都un掉*/
-        if (fn === null) {
+        if (!fn) {
             delete this._getEvents()[eventName];
         } else {
             const fns = this._getEvents()[eventName];