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日商模擬問題集   【NEW!!】2025/7/2　問題集更新済　第16回 珠算段位のわり算をついにリリースしました！(2025/6/14) 日商の検定模擬問題は全て網羅しています。 ※間違いがあれば「お問い合わせ」より教えて頂けると嬉しいです。   ★1ヶ月で新しい問題に入れ替えます★ 次回更新予定：2025/8/1頃     こんにちは、そろけん塾です。 […]

document.addEventListener("DOMContentLoaded", function () { let digit = 1; let count = 5; let speed = 1000; let numbers = []; let sum = 0; let currentIndex = 0; let interval; const canvas = document.getElementById("flash-canvas"); const ctx = canvas.getContext("2d"); function updateDisplay() { document.getElementById("digit-display").textContent = digit; document.getElementById("count-display").textContent = count; document.getElementById("speed-display").textContent = speed + "ms"; } document.getElementById("digit-slider").addEventListener("input", function () { digit = parseInt(this.value); updateDisplay(); }); document.getElementById("count-slider").addEventListener("input", function () { count = parseInt(this.value); updateDisplay(); }); document.getElementById("speed-slider").addEventListener("input", function () { speed = parseInt(this.value); updateDisplay(); }); function drawNumber(number) { ctx.clearRect(0, 0, canvas.width, canvas.height); ctx.font = "50px Arial"; ctx.fillStyle = "white"; ctx.textAlign = "center"; ctx.textBaseline = "middle"; ctx.fillText(number, canvas.width / 2, canvas.height / 2); } document.getElementById("start-button").addEventListener("click", function () { numbers = []; sum = 0; currentIndex = 0; document.getElementById("result-message").textContent = ""; document.getElementById("answer-input").value = ""; for (let i = 0; i < count; i++) { let num = Math.floor(Math.random() * (10 ** digit)); numbers.push(num); sum += num; } function showNextNumber() { if (currentIndex < numbers.length) { drawNumber(numbers[currentIndex]); currentIndex++; interval = setTimeout(showNextNumber, speed); } else { ctx.clearRect(0, 0, canvas.width, canvas.height); document.getElementById("question-area").textContent = "答えを入力してください"; } } showNextNumber(); }); document.getElementById("check-answer").addEventListener("click", function () { let userAnswer = parseInt(document.getElementById("answer-input").value, 10); if (userAnswer === sum) { document.getElementById("result-message").textContent = "正解！🎉"; document.getElementById("result-message").style.color = "green"; } else { document.getElementById("result-message").textContent = "不正解 😢 正解は " + sum; document.getElementById("result-message").style.color = "red"; } }); updateDisplay(); }); #flash-canvas { background-color: black; border-radius: 10px; display: block; margin: 10px auto; } input[type="range"] { width: 100%; } button { background-color: #008CBA; color: white; padding: 10px; border: none; border-radius: 5px; cursor: pointer; } button:hover { background-color: #005f73; }