【加强版】小学数学出题，加减乘除混合运算，支持自定义数字，一键打印

在线预览：在线HTML代码预览和运行工具 - UU在线工具复制下面代码后到该地址预览即可

注意：在线预览不能打印。如需打印，在电脑本地上新建文本文档，粘贴代码后保存，然后把文件后缀改为.html运行，出题点击打印就可以了

新增功能：
1、支持加减乘除运算混合多选
2、支持自定义数字运算个数
3、支持自定义出题数量
4、支持一键打印成pdf
5、小学数学没有负数，保证结果不出现负数
6、出题分列展示、新增答案下划线
7、界面美化

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<head><meta charset="UTF-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><title>小学生数学题生成器</title><style>body {font-family: Arial, sans-serif;background-color: #f4f4f4;margin: 0;display: block;flex-direction: column;align-items: center;justify-content: center;}#options {display: block;margin: 20px auto;background-color: #fff;border-radius: 5px;box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);padding: 20px;box-sizing: border-box;width: 500px;line-height: 35px;}label {margin-right: 10px;margin-bottom: 10px;font-size: 16px;}button {padding: 5px;background-color: #4caf50;color: #fff;border: none;border-radius: 5px;cursor: pointer;}#questions {display: flex;flex-wrap: wrap;justify-content: space-between;margin-top: 20px;}.question {width: 48%;box-sizing: border-box;padding: 10px;background-color: #fff;border-radius: 5px;box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);margin-bottom: 10px;font-size: 18px;}.answer {display: none;font-size: 16px;}#printHeader {display: none;margin-bottom: 20px;}@media print {#printHeader {display: block;text-align: center;margin-bottom: 30px; }body {margin: 30px; }.column {display: inline-block;width: 48%;box-sizing: border-box;margin-bottom: 20px;break-before: auto; }.question {page-break-inside: avoid; }@page {size: A4;margin: 25mm 10mm 25mm 10mm;}.question:nth-child(n+21) {display: none;}}div#printHeader {text-align: center;margin-bottom: 15px;
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<body><div class="hd1" style="text-align:center;font-size:35px;background-color: #4CAF50;min-height: 100px;padding-top: 50px;"><font>小学生数学题生成器</font></div><div id="options">运算符号：<label><input type="checkbox" id="additionCheckbox" checked="checked"> 加法</label><label><input type="checkbox" id="subtractionCheckbox"> 减法</label><label><input type="checkbox" id="multiplicationCheckbox"> 乘法</label><label><input type="checkbox" id="divisionCheckbox"> 除法</label><br><label>数字个数：<input type="number" id="numOfDigits" value="2" min="1" style="width: 50px;"></label> <br><label>允许小数：<input type="checkbox" id="allowDecimal"></label><br><label>数字范围：<label><input type="number" id="minRange" value="1" min="1" style="width: 50px;"></label>-<label><input type="number" id="maxRange" value="100" min="1" style="width: 50px;"></label></label><br><label>出题数量：<input type="number" id="numOfQuestions" value="30" min="1" style="width: 50px;"></label><br><button onclick="generateQuestions()">生成题目</button><button onclick="printQuestions()">一键打印</button><button onclick="toggleAnswers()">显示/隐藏答案</button></div><div id="questions"></div><script>function generateQuestions() {const addition = document.getElementById("additionCheckbox").checked;const subtraction = document.getElementById("subtractionCheckbox").checked;const multiplication = document.getElementById("multiplicationCheckbox").checked;const division = document.getElementById("divisionCheckbox").checked;const numOfDigits = document.getElementById("numOfDigits").value;const allowDecimal = document.getElementById("allowDecimal").checked;const minRange = parseInt(document.getElementById("minRange").value);const maxRange = parseInt(document.getElementById("maxRange").value);const numOfQuestions = document.getElementById("numOfQuestions").value;const questionsContainer = document.getElementById("questions");questionsContainer.innerHTML = "";for (let i = 0; i < numOfQuestions; i++) {let validQuestion = false;let questionText, answerText;while (!validQuestion) {const operators = getRandomOperators(addition, subtraction, multiplication, division, numOfDigits);const numbers = generateNumbers(numOfDigits, allowDecimal, minRange, maxRange);questionText = generateQuestionText(numbers, operators, allowDecimal);answerText = calculateAnswer(numbers, operators, allowDecimal).toFixed(allowDecimal ? 2 : 0);if (!containsNegativeNumber(questionText) && answerText >= 0) {validQuestion = true;}}const questionDiv = document.createElement("div");questionDiv.classList.add("question");questionDiv.innerHTML = `<span>${questionText}</span><span class="answer">${parseFloat(answerText)}</.toFixed(2)}</span>`;questionsContainer.appendChild(questionDiv);}}function getRandomOperators(addition, subtraction, multiplication, division, numOfDigits) {const availableOperators = [];if (addition) availableOperators.push('+');if (subtraction) availableOperators.push('-');if (multiplication && numOfDigits >= 2) availableOperators.push('*');if (division && numOfDigits >= 2) availableOperators.push('/');const selectedOperators = [];for (let i = 0; i < numOfDigits - 1; i++) {const randomOperator = availableOperators[Math.floor(Math.random() * availableOperators.length)];selectedOperators.push(randomOperator);}return selectedOperators;}function generateQuestionText(numbers, operators, allowDecimal) {let questionText = numbers[0].toString();for (let i = 0; i < operators.length; i++) {const operator = operators[i];const num = allowDecimal ? parseFloat(numbers[i + 1]).toFixed(2) : parseInt(numbers[i + 1]);questionText += ` ${operator.replace('*', 'x').replace('/', '÷')} ${num}`;}questionText += ' =';return questionText;}function generateNumbers(numOfDigits, allowDecimal, minRange, maxRange) {const randomNumber = () => allowDecimal ? (Math.random() * (maxRange - minRange) + minRange).toFixed(2): Math.floor(Math.random() * (maxRange - minRange + 1)) + minRange;const numbers = [];for (let i = 0; i < numOfDigits; i++) {numbers.push(randomNumber());}return numbers;}function calculateAnswer(numbers, operators, allowDecimal) {const calculateMulDiv = (nums, ops) => {for (let i = 0; i < ops.length; i++) {if (ops[i] === '*' || ops[i] === '/') {const result = ops[i] === '*' ? nums[i] * nums[i + 1] : nums[i] / nums[i + 1];nums.splice(i, 2, result);ops.splice(i, 1);i--;}}};const nums = numbers.map(num => parseFloat(num));const ops = operators.map(op => op);calculateMulDiv(nums, ops);let result = nums[0];for (let i = 0; i < ops.length; i++) {const num = nums[i + 1];const operator = ops[i];switch (operator) {case '+':result += num;break;case '-':result -= num;break;default:break;}}return allowDecimal? parseFloat(result.toFixed(2)): parseInt(result);}function containsNegativeNumber(questionText) {const parts = questionText.split(' ');for (let i = 0; i < parts.length; i++) {if (parseFloat(parts[i]) < 0) {return true;}}return false;}function printQuestions() {const printWindow = window.open('', '_blank');const printContent = document.getElementById("questions").innerHTML;printWindow.document.write(`<html lang="zh"><head><meta charset="UTF-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><title>打印题目</title><style>body {font-family: Arial, sans-serif;margin: 30px; }.column {display: inline-block;width: 48%;box-sizing: border-box;margin-bottom: 20px;}.question {padding: 10px;background-color: #fff;border-radius: 5px;box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);margin-bottom: 10px;font-size: 18px;}.answer {display: none;font-size: 16px;}</style></head><body><div id="printHeader" style="text-align: center;margin-bottom: 20px;"><div>姓名：_________ 日期：____月____日 时间：________ 答对：_______题</div></div><div class="column" id="column1"></div><div class="column" id="column2"></div></body></html>`);const column1 = printWindow.document.getElementById("column1");const column2 = printWindow.document.getElementById("column2");const questions = document.querySelectorAll('.question');let countColumn1 = 0;let countColumn2 = 0;questions.forEach((question, index) => {const column = index % 2 === 0 ? column1 : column2;const clonedQuestion = question.cloneNode(true);// Replace answer content with formatted answerconst answerElement = clonedQuestion.querySelector('.answer');const answerText = answerElement.textContent;answerElement.textContent = parseFloat(answerText).toFixed(2);column.appendChild(clonedQuestion);if (index % 2 === 0) {countColumn1++;} else {countColumn2++;}});printWindow.document.close();printWindow.print();}function toggleAnswers() {const answers = document.querySelectorAll('.answer');answers.forEach(answer => {answer.style.display = (answer.style.display === 'none' || answer.style.display === '') ? 'inline' : 'none';});}</script>
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