[Get PNG from layers]Get PNG from layer in a group by hide/show one by one #Photoshop

gistfile1.js

main();
function main(){
  var doc = activeDocument;
	var docPath = activeDocument.path;
	
	var marketApps = doc.layerSets.getByName("Group Name");
	
	
	for(var a=0; a<marketApps.layers.length; a++){
		//alert(marketApps.layers[a]);
		marketApps.layers[a].visible = true;
		saveAsPNG(marketApps.layers[a].name);
		marketApps.layers[a].visible = false;
	}
	
	// LayerSets = group
	alert(marketApps.layers.length);
	
}

function saveAsPNG(nameFile){ 
var Name = app.activeDocument.name.replace(/\.[^\.]+$/, ''); 
var Ext = decodeURI(app.activeDocument.name).replace(/^.*\./,''); 
if(Ext.toLowerCase() != 'psd') return; 
var Path = app.activeDocument.path; 
var saveFile = File(Path + "/" + nameFile +".png"); 
if(saveFile.exists) saveFile.remove(); 
SavePNG(saveFile); 
} 
function SavePNG(saveFile){ 
    pngSaveOptions = new PNGSaveOptions(); 
activeDocument.saveAs(saveFile, pngSaveOptions, true, Extension.LOWERCASE); 
}