【photoshop】選択中のフォントファミリーの太さを一段変える

太くする

var activeFontWeight = app.activeDocument.activeLayer.textItem.font;
var fontFamily = app.fonts.getByName(activeFontWeight).family;
var fontWeights = [];
var nextFontWeight;

for (var i = 0; i < app.fonts.length; i++) {
    if (app.fonts[i].family == fontFamily) {
        fontWeights.push(app.fonts[i]);
    }
}

for (var i = 0; i < fontWeights.length; i++) {
    if (fontWeights[i].postScriptName == activeFontWeight) {
        if (i == (fontWeights.length - 1)) {
            nextFontWeight = fontWeights[i];
        } else {
            nextFontWeight = fontWeights[i + 1];
        }
        break;
    }
}

app.activeDocument.activeLayer.textItem.font = nextFontWeight.postScriptName;

細くする

var activeFontWeight = app.activeDocument.activeLayer.textItem.font;
var fontFamily = app.fonts.getByName(activeFontWeight).family;
var fontWeights = [];
var nextFontWeight;

for (var i = 0; i < app.fonts.length; i++) {
    if (app.fonts[i].family == fontFamily) {
        fontWeights.push(app.fonts[i]);
    }
}

for (var i = 0; i < fontWeights.length; i++) {
    if (fontWeights[i].postScriptName == activeFontWeight) {
        if (i == 0) {
            nextFontWeight = fontWeights[i];
        } else {
            nextFontWeight = fontWeights[i - 1];
        }
        break;
    }
}

app.activeDocument.activeLayer.textItem.font = nextFontWeight.postScriptName;