src/js/qrcode.js
function _safeSetDataURI(fSuccess, fFail) {
            var self = this;
            self._fFail = fFail;
            self._fSuccess = fSuccess;

            // Check it just once
            if (self._bSupportDataURI === null) {
                var el = document.createElement("img");
                var fOnError = function() {
                    self._bSupportDataURI = false;

                    if (self._fFail) {
                        self._fFail.call(self);
                    }
                };
                var fOnSuccess = function() {
                    self._bSupportDataURI = true;

                    if (self._fSuccess) {
                        self._fSuccess.call(self);
                    }
                };

                el.onabort = fOnError;
                el.onerror = fOnError;
                el.onload = fOnSuccess;
                el.src = "data:image/gif;base64,iVBORw0KGgoAAAANSUhEUgAAAAUAAAAFCAYAAACNbyblAAAAHElEQVQI12P4//8/w38GIAXDIBKE0DHxgljNBAAO9TXL0Y4OHwAAAABJRU5ErkJggg=="; // the Image contains 1px data.
                return;
            } else if (self._bSupportDataURI === true && self._fSuccess) {
                self._fSuccess.call(self);
            } else if (self._bSupportDataURI === false && self._fFail) {
                self._fFail.call(self);
            }
		}
function _safeSetDataURI(fSuccess, fFail) {
            var self = this;
            self._fFail = fFail;
            self._fSuccess = fSuccess;

            // Check it just once
            if (self._bSupportDataURI === null) {
                var el = document.createElement("img");
                var fOnError = function() {
                    self._bSupportDataURI = false;

                    if (self._fFail) {
                        self._fFail.call(self);
                    }
                };
                var fOnSuccess = function() {
                    self._bSupportDataURI = true;

                    if (self._fSuccess) {
                        self._fSuccess.call(self);
                    }
                };

                el.onabort = fOnError;
                el.onerror = fOnError;
                el.onload = fOnSuccess;
                el.src = "data:image/gif;base64,iVBORw0KGgoAAAANSUhEUgAAAAUAAAAFCAYAAACNbyblAAAAHElEQVQI12P4//8/w38GIAXDIBKE0DHxgljNBAAO9TXL0Y4OHwAAAABJRU5ErkJggg=="; // the Image contains 1px data.
                return;
            } else if (self._bSupportDataURI === true && self._fSuccess) {
                self._fSuccess.call(self);
            } else if (self._bSupportDataURI === false && self._fFail) {
                self._fFail.call(self);
            }
		}
function _safeSetDataURI ( fSuccess , fFail ) { var self = this ; self . _fFail = fFail ; self . _fSuccess = fSuccess ; // Check it just once if ( self . _bSupportDataURI === null ) { var el = document . createElement ( "img" ) ; var fOnError = function ( ) { self . _bSupportDataURI = false ; if ( self . _fFail ) { self . _fFail . call ( self ) ; } } ; var fOnSuccess = function ( ) { self . _bSupportDataURI = true ; if ( self . _fSuccess ) { self . _fSuccess . call ( self ) ; } } ; el . onabort = fOnError ; el . onerror = fOnError ; el . onload = fOnSuccess ; el . src = "data:image/gif;base64,iVBORw0KGgoAAAANSUhEUgAAAAUAAAAFCAYAAACNbyblAAAAHElEQVQI12P4//8/w38GIAXDIBKE0DHxgljNBAAO9TXL0Y4OHwAAAABJRU5ErkJggg==" ; // the Image contains 1px data. return ; } else if ( self . _bSupportDataURI === true && self . _fSuccess ) { self . _fSuccess . call ( self ) ; } else if ( self . _bSupportDataURI === false && self . _fFail ) { self . _fFail . call ( self ) ; } }
Check whether the user's browser supports Data URI or not

@private
@param {Function} fSuccess Occurs if it supports Data URI
@param {Function} fFail Occurs if it doesn't support Data URI
Check whether the user s browser supports Data URI or not