甚至是随机数，javascript [英] even random number, javascript

问题描述

我每次如何生成偶数随机数？我每次都可以生成一个

随机数，但不是偶数？这是我使用的代码来自

1-100的随机数。


< script type =" text / javascript">

否= math.random（）* 100

document.write（math.round（no））

< / script>

谢谢，

Deb


***通过Developersdex发送 http://www.developersdex.com ***

How would I generate a even random number each time? I can generate a
random number each time but not an even one? Here is the code I use for
the random number from 1-100.

<script type="text/javascript">
no=math.random()*100
document.write (math.round(no))
</script>
Thanks,
Deb

*** Sent via Developersdex http://www.developersdex.com ***

推荐答案

Debbie Lucier

Debbie Lucier

我每次如何生成偶数随机数？我每次都可以生成一个
随机数但不是偶数？这是我用来从1-100开始随机数的代码。

How would I generate a even random number each time? I can generate a
random number each time but not an even one? Here is the code I use for
the random number from 1-100.

呃，从1-50生成一个随机数，然后乘以2 。


干杯

Richard。

Er, generate a random one from 1-50 and multiply it by 2.

Cheers
Richard.

Debbie Lucier写道：

Debbie Lucier wrote:

我每次如何生成偶数随机数？我每次都可以生成一个
随机数但不是偶数？这是我用于1-100的随机数的代码。

< script type =" text / javascript">
no = math.random（ ）* 100
document.write（math.round（no））
< / script>

How would I generate a even random number each time? I can generate a
random number each time but not an even one? Here is the code I use for
the random number from 1-100.

<script type="text/javascript">
no=math.random()*100
document.write (math.round(no))
</script>

rf的答案应该做诀窍，但零怎么样？应该包括

，或者你的范围是2-100？

-

Rob

rf''s answer should do the trick, but what about zero? Should it be
included, or is your range 2-100?
--
Rob

Debbie Lucier写道：

Debbie Lucier wrote:

每次如何生成偶数随机数？我每次都可以生成一个
随机数但不是偶数？这是我用于1-100的随机数的代码。

< script type =" text / javascript">
no = math.random（ ）* 100
document.write（math.round（no））
< / script>

谢谢，
Deb

***通过开发人员指南 http://www.developersdex.com 发送***

How would I generate a even random number each time? I can generate a
random number each time but not an even one? Here is the code I use for
the random number from 1-100.

<script type="text/javascript">
no=math.random()*100
document.write (math.round(no))
</script>
Thanks,
Deb

*** Sent via Developersdex http://www.developersdex.com ***

Math.round（）偏向更高的数字（4.5总是5到
总是从不到4），因此起始数字的概率较低

发生在所有其他人身上。


更好的分配是截断数字的小数部分

在两者之间最小值和最大值加一：

< script type =" text / javascript">


函数genRandom（min，max）{

返回min +（max-min + 1）* Math.random（）| 0;

}


document.write（genRandom（0,50）* 2）;


< ; / script>


-

Zif

Math.round() has a bias toward the higher numbers (4.5 goes to 5
always and never to 4), so the starting number has a lower chance of
occurring that all the others.

A better distribution is from truncating the decimal part of numbers
in a range between min and max plus one :
<script type="text/javascript">

function genRandom( min, max ) {
return min + (max-min+1)*Math.random() | 0;
}

document.write( genRandom( 0, 50 )*2 );

</script>

--
Zif

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