diff --git a/kefu.js b/kefu.js
index 0d46bcc63686e0eb10d4a6f70d3221d0da699c64..05c4f4695b4ba3639f8d62ce67fb0530b719db68 100644
--- a/kefu.js
+++ b/kefu.js
@@ -1144,11 +1144,14 @@ var kefu = {
 					    kefu.ui.chat.pc.chatWindowDiv.style.marginTop = nt + 'px';
 					};
 					//鼠标抬起事件
-					kefu.ui.chat.pc.chatHeadWindowDiv.onmouseup = function() {
-					    //开关关闭
-						kefu.ui.chat.pc.isDown = false;
-					    kefu.ui.chat.pc.chatHeadWindowDiv.style.cursor = 'default';
-					};
+					window.onmouseup = function() {
+                        if(kefu.ui.chat.pc.isDown) {
+                            //开关关闭
+                            kefu.ui.chat.pc.isDown = false;
+                            kefu.ui.chat.pc.chatHeadWindowDiv.style.cursor = 'default';
+                        }
+                        
+                    };
 					
 				}
 			}