我有一个程序可以计算如何使用 4 个数字获得 24：
<!DOCTYPE html>
<link rel="stylesheet" href="style.css">
<title>Calculate 24 Solutions</title>
<script src="clock.js"></script>
The game 24 (aka. Combine 4) gives you 4 numbers, and you have to do operations using all four numbers to make 24. Some of the questions are quite tricky! If you need help getting the solution, click the button below and follow the directions! It will give you a list of all the solutions. One operation you may not be familliar with is modulo. It takes 2 numbers, divides to first number by the second number, and returns the remainder.<br><br>
+ is addition<br>
- is subtraction<br>
* is multiplication<br>
/ is division<br>
^ is exponents<br>
% is modulo<br><br>
<script>
var solutions = []; var power; var mod; var powStr; var modStr; var answerStr;
function doop(var1, var2, op) {
if (op == '+') {
return Number(var1) + Number(var2);
} else if (op == '-') {
return Number(var1) - Number(var2);
} else if (op == '*') {
return Number(var1) * Number(var2);
} else if (op == '/') {
return Number(var1) / Number(var2);
} else if (op == '%') {
return Number(var1) % Number(var2);
} else if (op == '^') {
return Math.pow(Number(var1), Number(var2));
} else {
alert("Invalid number or operation! Cannot doop() these parameters!");
}
}
function getNumbers() {
solutions = [];
var invalid = false;
alert("Let's start calculating!");
power = prompt("Include exponents (the power operation)?");
mod = prompt("Include the modulo operation?");
if (power.toLowerCase().substring(0, 1) == "y") {
power = "yes";
} else if (power.toLowerCase().substring(0, 1) == "n") {
power = "no";
} if (mod.toLowerCase().substring(0, 1) == "y") {
mod = "yes";
} else if (mod.toLowerCase().substring(0, 1) == "n") {
mod = "no";
}
var a = prompt("What is number 1?");
var b = prompt("What is number 2?");
var c = prompt("What is number 3?");
var d = prompt("What is number 4?");
if (isNaN(a) || a > 13 || a < 0 || a == '' || a === null) {
alert("The first number is invalid!");
invalid = true;
}
if (isNaN(b) || b > 13 || b < 0 || b == '' || b === null) {
alert("The second number is invalid!");
invalid = true;
}
if (isNaN(c) || c > 13 || c < 0 || c == '' || c === null) {
alert("The third number is invalid!");
invalid = true;
}
if (isNaN(d) || d > 13 || d < 0 || d == '' || d === null) {
alert("The fourth number is invalid!");
invalid = true;
}
if (power.toLowerCase() != "yes" && power.toLowerCase() != "no") {
alert("The exponent prompt response is invalid!");
invalid = true;
}
if (mod.toLowerCase() != "yes" && mod.toLowerCase() != "no") {
alert("The modulo prompt response is invalid!");
invalid = true;
}
while (invalid === true) {
power = prompt("Include exponents (the power operation)?");
mod = prompt("Include the modulo operation?");
a = prompt("What is number 1?");
b = prompt("What is number 2?");
c = prompt("What is number 3?");
d = prompt("What is number 4?");
invalid = false;
if (isNaN(a) || a > 13 || a < 0 || a == '' || a === null) {
alert("The first number is invalid!");
invalid = true;
}
if (isNaN(b) || b > 13 || b < 0 || b == '' || b === null) {
alert("The second number is invalid!");
invalid = true;
}
if (isNaN(c) || c > 13 || c < 0 || c == '' || c === null) {
alert("The third number is invalid!");
invalid = true;
}
if (isNaN(d) || d > 13 || d < 0 || d == '' || d === null) {
alert("The fourth number is invalid!");
invalid = true;
}
if (power.toLowerCase() != "yes" && power.toLowerCase() != "no") {
alert("The exponent prompt response is invalid!");
invalid = true;
}
if (mod.toLowerCase() != "yes" && mod.toLowerCase() != "no") {
alert("The modulo prompt response is invalid!");
invalid = true;
}
if (power.toLowerCase().substring(0, 1) == "y") {
power = "yes";
} else if (power.toLowerCase().substring(0, 1) == "n") {
power = "no";
} if (mod.toLowerCase().substring(0, 1) == "y") {
mod = "yes";
} else if (mod.toLowerCase().substring(0, 1) == "n") {
mod = "no";
}
}
return [a, b, c, d];
}
function calculate(a, b, c, d) {
var op1 = ['+', '-', '*', '/'];
var op2 = ['+', '-', '*', '/'];
var op3 = ['+', '-', '*', '/'];
if (mod.toLowerCase() == "yes") {
op1.push('%');
op2.push('%');
op3.push('%');
}
if (power.toLowerCase() == "yes") {
op1.push('^');
op2.push('^');
op3.push('^');
}
var i1; var i2; var i3;
for (i1 = 0; i1 < op1.length; i1++) {
for (i2 = 0; i2 < op2.length; i2++) {
for (i3 = 0; i3 < op3.length; i3++) {
if (doop(doop(doop(a, b, op1[i1]), c, op2[i2]), d, op3[i3]) == 24) {
solutions.push('((' + a + op1[i1] + b + ')' + op2[i2] + c + ')' + op3[i3] + d + ' = 24');
}
if (doop(doop(a, doop(b, c, op1[i1]), op2[i2]), d, op3[i3]) == 24) {
solutions.push('(' + a + op2[i2] + '(' + b + op1[i1] + c + '))' + op3[i3] + d + ' = 24');
}
if (doop(doop(a, b, op1[i1]), doop(c, d, op2[i2]), op3[i3]) == 24) {
solutions.push('(' + a + op1[i1] + b + ')' + op3[i3] + '(' + c + op2[i2] + d + ') = 24');
}
if (doop(a, doop(doop(b, c, op1[i1]), d, op2[i2]), op3[i3]) == 24) {
solutions.push(a + op3[i3] + '((' + b + op1[i1] + c + ')' + op2[i2] + d + ') = 24');
}
if (doop(a, doop(b, doop(c, d, op1[i1]), op2[i2]), op3[i3]) == 24) {
solutions.push(a + op3[i3] + '(' + b + op2[i2] + '(' + c + op1[i1] + d + ')) = 24');
}
}
}
}
}
function enumerate() {
var num = getNumbers();
var a; var b; var c; var d;
for (var ai = 0; ai < 4; ai++) {
a = num[ai];
for (var bi = 0; bi < 4; bi++) {
if (bi != ai) {
b = num[bi];
for (var ci = 0; ci < 4; ci++) {
if (ci != ai && ci != bi) {
c = num[ci];
for (var di = 0; di < 4; di++) {
if (di != ai && di != bi && di != ci) {
d = num[di];
calculate(a, b, c, d);
}
}
}
}
}
}
}
if (power.toLowerCase() == "yes") {
powStr = "did";
} else {
powStr = "did not";
}
if (mod.toLowerCase() == "yes") {
modStr = "did";
} else {
modStr = "did not";
}
if (solutions.length == 0) {
answerStr = "Sorry, no solution found.";
} else {
answerStr = solutions.length + " solutions found:";
}
var solutionWindow = window.open('','_blank','width=500,height=1000');
solutionWindow.document.write("<link rel=\"stylesheet\" href=\"style.css\">Your numbers are:<br>\n" + num[0] + ', ' + num[1] + ', ' + num[2] + ', and ' + num[3] + "<br><br>\n" + 'You ' + powStr + ' include exponents.<br>You ' + modStr + ' include modulo.' + '<br><br>\n' + answerStr + '<br>\n');
solutionWindow.document.write(solutions.join("<br>\n"));
solutionWindow.document.write("<br><br>\n<a href=\"#\"><button>Back to top</button></a><br>");
solutionWindow.document.write("<br>\n<button onclick=\"javascript: self.close()\">Close Window</button>");
solutionWindow.focus();
}
</script>
<button onclick="javascript: enumerate()">Calculate Solution</button>
我的样式.css：
html {
background-color: lightYellow;
overflow: scroll;
}
button {
height: 50px;
width: 150px;
border: none;
border-radius: 25px;
color: white;
background-image: -webkit-linear-gradient(white, lightGreen, green, darkGreen, green, lightGreen, white);
background-image: -moz-linear-gradient(white, lightGreen, green, darkGreen, green, lightGreen, white);
background-image: -o-linear-gradient(white, lightGreen, green, darkGreen, green, lightGreen, white);
background-image: linear-gradient(white, lightGreen, green, darkGreen, green, lightGreen, white);
}
button:focus {
color: black;
background-image: -webkit-linear-gradient(darkGreen, green, lightGreen, white, lightGreen, green, darkGreen);
background-image: -moz-linear-gradient(darkGreen, green, lightGreen, white, lightGreen, green, darkGreen);
background-image: -o-linear-gradient(darkGreen, green, lightGreen, white, lightGreen, green, darkGreen);
background-image: linear-gradient(darkGreen, green, lightGreen, white, lightGreen, green, darkGreen);
}
button:hover {
color: white;
background-image: -webkit-linear-gradient(white, lightBlue, blue, darkBlue, blue, lightBlue, white);
background-image: -moz-linear-gradient(white, lightBlue, blue, darkBlue, blue, lightBlue, white);
background-image: -o-linear-gradient(white, lightBlue, blue, darkBlue, blue, lightBlue, white);
background-image: linear-gradient(white, lightBlue, blue, darkBlue, blue, lightBlue, white);
}
button:active {
color: black;
border: none;
background-image: -webkit-linear-gradient(darkBlue, blue, lightBlue, white, lightBlue, blue, darkBlue);
background-image: -moz-linear-gradient(darkBlue, blue, lightBlue, white, lightBlue, blue, darkBlue);
background-image: -o-linear-gradient(darkBlue, blue, lightBlue, white, lightBlue, blue, darkBlue);
background-image: linear-gradient(darkBlue, blue, lightBlue, white, lightBlue, blue, darkBlue);
}
但是，在 IE 中，当它打开新窗口时，没有滚动条，所以有时我看不到所有的解决方案。不过，它在 Google Chrome 中运行良好。