源代码 采用穷举计算方法
讲人话：根据四个数随机列算式，算出来是24就显示在列表里。
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>24 Point Game</title>
<style>
body {
background: #f0f0f0;
font-family: Arial, sans-serif;
margin: 0;
padding: 0;
display: flex;
justify-content: center;
align-items: center;
min-height: 100vh;
}
.game-container {
background: #fff;
border-radius: 10px;
box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
padding: 20px;
width: 400px;
}
h1 {
text-align: center;
color: #333;
}
input[type="number"] {
width: 100%;
padding: 10px;
margin-bottom: 10px;
border: none;
border-radius: 5px;
box-shadow: inset 0 1px 3px rgba(0, 0, 0, 0.1);
}
button {
width: 100%;
padding: 10px;
background: #007bff;
color: #fff;
border: none;
border-radius: 5px;
cursor: pointer;
transition: background 0.3s;
}
button:hover {
background: #0056b3;
}
.results {
margin-top: 20px;
color: #333;
}
.results p {
margin: 5px 0;
}
</style>
</head>
<body>
<div class="game-container">
<h1>24 Point Game</h1>
<input type="number" id="num1" placeholder="Enter Number 1">
<input type="number" id="num2" placeholder="Enter Number 2">
<input type="number" id="num3" placeholder="Enter Number 3">
<input type="number" id="num4" placeholder="Enter Number 4">
<button οnclick="solve24Point()">Calculate</button>
<div class="results" id="results"></div>
</div>
<script>
function solve24Point() {
const numbers = [
parseFloat(document.getElementById('num1').value),
parseFloat(document.getElementById('num2').value),
parseFloat(document.getElementById('num3').value),
parseFloat(document.getElementById('num4').value)
];
const solutions = findSolutions(numbers);
displaySolutions(solutions);
}
function findSolutions(nums) {
const ops = ['+', '-', '*', '/'];
const solutions = [];
const permutations = getPermutations(nums);
for (let perm of permutations) {
for (let op1 of ops) {
for (let op2 of ops) {
for (let op3 of ops) {
let expr = `(${perm[0]} ${op1} ${perm[1]}) ${op2} (${perm[2]} ${op3} ${perm[3]})`;
let result = evalExpression(expr);
if (Math.abs(result - 24) < 0.01) {
solutions.push(`(${perm[0]} ${op1} ${perm[1]}) ${op2} (${perm[2]} ${op3} ${perm[3]}) = ${result.toFixed(2)}`);
}
}
}
}
}
return solutions;
}
function getPermutations(arr) {
if (arr.length <= 2) return arr.length === 2 ? [arr, [arr[1], arr[0]]] : arr;
return arr.reduce((acc, item, i) => acc.concat(
getPermutations(arr.slice(0, i).concat(arr.slice(i + 1)))
.map(x => [item].concat(x))
), []);
}
function evalExpression(expression) {
try {
return eval(expression);
} catch (e) {
return NaN;
}
}
function displaySolutions(solutions) {
const resultsDiv = document.getElementById('results');
resultsDiv.innerHTML = '';
if (solutions.length > 0) {
solutions.forEach(solution => {
resultsDiv.innerHTML += `<p>${solution}</p>`;
});
} else {
resultsDiv.innerHTML = '<p>No solution found.</p>';
}
}
</script>
</body>
</html>
)
)
)
