Cách tạo Sheet random cảnh nền tự động

const backgrounds = bgSheet.getRange('A1:A').getValues().filter(String).flat();
const title = inputSheet.getRange('A2').getValue();
const timestamp = new Date();

const numPrompts = 5; // Tạo 5 prompt mỗi lần
for (let i = 0; i < numPrompts; i++) {
const randBg = backgrounds[Math.floor(Math.random() * backgrounds.length)];
const prompt = `${title}, in the style of a cute cartoon monk character, anime-chibi style, full body, big sparkling eyes, gentle smile, shaved head, grey Buddhist robe, prayer beads, sitting ${randBg}, peaceful spiritual vibe, warm vintage tone, soft lighting, high quality --v 5 --ar 2:3`;

// Ghi vào PromptGenerator sheet
inputSheet.getRange(2, 2 + i * 2).setValue(randBg);
inputSheet.getRange(2, 3 + i * 2).setValue(prompt);

// Append vào Prompt sheet
outputSheet.appendRow([timestamp, title, randBg, prompt]);
}