src/util/focus/platform/focus.js
function(_clazz,_event){
            var _element = _v._$getElement(_event);
            if (!_element.value)
                _e._$delClassName(_element,_clazz);
        }
function(_clazz,_event){
            var _element = _v._$getElement(_event);
            if (!_element.value)
                _e._$delClassName(_element,_clazz);
        }
function ( _clazz , _event ) { var _element = _v . _$getElement ( _event ) ; if ( ! _element . value ) _e . _$delClassName ( _element , _clazz ) ; }
do blur check
do blur check