Who knows what this command script code is? As shown in the screenshot--export for screens

Hi,

I am not able to understand your question completely. But if I am not wrong and your are looking for the script that exports the selected items, you can try the following

var doc = app.activeDocument;
var docAssets = doc.assets;
var assetIDArray = new Array();
var itemToExport = new ExportForScreensItemToExport();
itemToExport.artboards = '';
itemToExport.document = false;
var assetArray = new Array();
for (var i = 0; i < app.selection.length; i++) {
    var asset = docAssets.add(app.selection[i]);
    assetIDArray.push(asset.assetID);
}
itemToExport.assets = assetIDArray;
var options = new ExportForScreensOptionsPNG24();
app.activeDocument.exportForScreens(File('~/Desktop'), ExportForScreensType.SE_PNG24, options, itemToExport);