两个数字之间的Javascript随机整数

Javascript Random Integer Between two Numbers

我试图创建一个随机数生成器，在两个数字之间生成随机数。例如，假设我想生成一个4到10之间的随机数，我希望它能够从4到10之间的任意数字中进行选择。以下是我的尝试：

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var randNumMin = 4;
var randNumMax = 10;
var randInt = (Math.floor(Math.random() * (randNumMax - randNumMin + 1)) + randNumMin);

然而，这似乎不起作用，产生了不在4到10之间的奇怪的随机数，有些以0开头。正确的算法是什么？

下面是我在以下代码中实现算法的代码：

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$(function() {
$('#generateRandNums').click(function() {

var numCount = document.getElementById("randNumCount").value;
var randNumMin = document.getElementById("randNumMin").value;
var randNumMax = document.getElementById("randNumMax").value;

if (numCount.match(/^[\d]*$/ ) && randNumMin.match(/^[\d]*$/ ) && randNumMax.match(/^[\d]*$/ )) {
if (numCount =="" || randNumMin =="" || randNumMax =="") {
alert ("Please fill out all forms then try again.");

} else {
if (randNumMin>randNumMax) {
alert ("Please make sure your first number is smaller than the second, then try again.");
} else {
if (randNumMin<0) {
alert ("Please make sure that you generate a positive number of random numbers, then try again.");
} else {

if (numCount>1) {
var randResult = ("You generated" + numCount +" random numbers between" + randNumMin +" and" + randNumMax +" and got the numbers")
oneNumber = 0;
} else {
var randResult = ("You generated a random number between" + randNumMin +" and" + randNumMax +" and got the number");
oneNumber = 1;
}
for (i=0;i<numCount;i++) {
//Get a random number between randNumMin and randNumMax
var randInt = (Math.floor(Math.random() * (randNumMax - randNumMin + 1)) + randNumMin);
if (i == numCount-1) {
if (oneNumber == 0) {
randResult = (randResult +"and" + randInt +".");
} else {
randResult = (randResult + randInt +".");
}
} else {
randResult = (randResult + randInt +",");
}
}
$("#randNumResults").val(randResult);
}
}
}
} else {
alert ("Make sure you only enter numbers and no spaces, then try again.");
}

});
});

我还试着用这个替换兰丁线：

1	var randInt = Math.floor((Math.random() * ((randNumMax + 1) - randNumMin)) + randNumMin);

它仍然不起作用。我不确定算法是错误的，还是把它错误地合并到函数中。感谢您的回答。

相关讨论

在特定范围内用javascript生成随机整数？

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/**
* Returns a random number between min and max
*/
function getRandomArbitary (min, max) {
return Math.random() * (max - min) + min;
}

/**
* Returns a random integer between min and max
* Using Math.round() will give you a non-uniform distribution!
*/
function getRandomInt (min, max) {
return Math.floor(Math.random() * (max - min + 1)) + min;
}

http://roshanbh.com.np/2008/09/get-random-number-range-two-numbers-javascript.html

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//function to get random number upto m
function randomXToY(minVal,maxVal,floatVal)
{
var randVal = minVal+(Math.random()*(maxVal-minVal));
return typeof floatVal=='undefined'?Math.round(randVal):randVal.toFixed(floatVal);
}

或

在javascript中生成两个数字之间的随机数

相关讨论

对于这个随机变量(最小值，最大值)，js有一个很好的实用程序。

您的问题是您从未将字符串转换为数字，请尝试添加此字符串

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if ( numCount.match(/^[\d]*$/ ) &&
randNumMin.match(/^[\d]*$/ ) &&
randNumMax.match(/^[\d]*$/ )){
if (numCount ==="" || randNumMin ==="" || randNumMax ==="") {
alert ("Please fill out all forms then try again.");
} else {
numCount=numCount-0;randNumMin=randNumMin-0;randNumMax=randNumMax-0;

另一个注意事项是，您需要将检查值是否为空字符串更改为严格相等。为了了解我的意思，尝试对其中一个值使用零。0 ==""//returns true，因为两者都是不可靠的0 ===""//returns false。

相关讨论

这个怎么样？

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var max = 10;
var min = 4;
var random = Math.floor((Math.random() * ((max + 1) - min)) + min);

相关讨论