式1 シンプルな回答 <script> //初期値 const xStart = 1, yStart = 1; const xEnd = 9, yEnd = 9; //処理 const maxLen = String(xEnd*yEnd).length; let output = ""; for(let x = xStart; x <= xEnd; x++){ for(let y = yStart; y <= yEnd; y++){ output += "."; …

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