Steps to Reproduce

http://zkfiddle.org/sample/1h23j2b/4-test-zkbinder

click the button

Current Result

got a js error

Expected Result

should not get any js error

Debug Information

Registers multiple callbacks with same command,
the callback function of binder.after('cmd', fn) execute binder.unAfter('cmd', fn).
cause  "this._aftercmd[cmd]" changed during the for loop

Workaround

zk.afterLoad('zkbind', function() {
var _xBinder = {};
zk.override(zkbind.Binder.prototype, _xBinder, {
$doAfterCommand: function (cmd, args)

{ var ac = this._aftercmd[cmd]; if (ac) ac = ac.slice(); for (var i = 0, j = ac ? ac.length : 0; i < j; i++) ac[i].apply(this, [args]); }

});
})