How to use the cordova/utils.defineGetterSetter function in cordova

function defineEvent (eventName) {
    utils.defineGetterSetter(FileReader.prototype, eventName, function () {
        return this._realReader[eventName] || null;
    }, function (value) {
        this._realReader[eventName] = value;
    });
}
defineEvent('onloadstart');    // When the read starts.

function defineEvent(eventName) {
    utils.defineGetterSetter(FileReader.prototype, eventName, function() {
        return this._realReader[eventName] || null;
    }, function(value) {
        this._realReader[eventName] = value;
    });
}
defineEvent('onloadstart');    // When the read starts.

function defineEvent(eventName) {
    utils.defineGetterSetter(FileReader.prototype, eventName, function() {
        return this._realReader[eventName] || null;
    }, function(value) {
        this._realReader[eventName] = value;
    });
}
defineEvent('onloadstart');    // When the read starts.

function defineEvent(eventName) {
    utils.defineGetterSetter(FileReader.prototype, eventName, function() {
        return this._realReader[eventName] || null;
    }, function(value) {
        this._realReader[eventName] = value;
    });
}
defineEvent('onloadstart');    // When the read starts.

(function (k) {
                    utils.defineGetterSetter(newNavigator, key, function () {
                        return origNavigator[k];
                    });
                })(key);
            }

(function(k) {
                    utils.defineGetterSetter(newNavigator,key,function() {
                        return origNavigator[k];
                    });
                })(key);
            }

(function(k) {
                    utils.defineGetterSetter(newNavigator,key,function() {
                        return origNavigator[k];
                    });
                })(key);
            }

function defineEvent(eventName) {
    utils.defineGetterSetter(FileReader.prototype, eventName, function() {
        return this.nativeReader[eventName] || null;
    }, function(value) {
        this.nativeReader[eventName] = value;
    });
}

function defineEvent(eventName) {
    utils.defineGetterSetter(FileReader.prototype, eventName, function() {
        return this.nativeReader[eventName] || null;
    }, function(value) {
        this.nativeReader[eventName] = value;
    });
}