use proxy not bind in alert

dist/js/bootstrap.js

@@ -296,7 +296,7 @@ var Alert = (function ($) {
           return;
         }
 
-        $(element).one(Util.TRANSITION_END, this._destroyElement.bind(this, element)).emulateTransitionEnd(TRANSITION_DURATION);
+        $(element).one(Util.TRANSITION_END, $.proxy(this._destroyElement, this, element)).emulateTransitionEnd(TRANSITION_DURATION);
       }
     }, {
       key: '_destroyElement',

dist/js/umd/alert.js

@@ -140,7 +140,7 @@
             return;
           }
 
-          $(element).one(_Util['default'].TRANSITION_END, this._destroyElement.bind(this, element)).emulateTransitionEnd(TRANSITION_DURATION);
+          $(element).one(_Util['default'].TRANSITION_END, $.proxy(this._destroyElement, this, element)).emulateTransitionEnd(TRANSITION_DURATION);
         }
       }, {
         key: '_destroyElement',

js/src/alert.js

@@ -116,7 +116,7 @@ const Alert = (($) => {
       }
 
       $(element)
-        .one(Util.TRANSITION_END, this._destroyElement.bind(this, element))
+        .one(Util.TRANSITION_END, $.proxy(this._destroyElement, this, element))
         .emulateTransitionEnd(TRANSITION_DURATION)
     }