这是解决我的问题：

对于bootstrap 3.0

For bootstrap 3.0

$('#myModal').on('shown.bs.modal', function () {
   $(document).off('focusin.modal');
  })

其他较低版本由telerik提供

for other lower version as provided by telerik

$('#myModal').on('shown', function () {
  $(document).off('focusin.modal');
});