#target Photoshop
var docRef = app.activeDocument;
var activeLayer = docRef.activeLayer;

if (activeLayer.kind == "LayerKind.TEXT") {
    var textLayerFont = activeLayer.textItem.font;
    alert(app.fonts[textLayerFont].family + "," + app.fonts[textLayerFont].style);
} else {
    alert("テキストレイヤーを選択してください。")
}