如何在javascript中生成1到20之间的5个随机数 [英] How to generate 5 random numbers between 1 to 20 in javascript
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问题描述
大家好
我正在编写代码,我需要从给定范围生成5个数字(此处介于1到20之间)。
我可以生成一个随机数,如下所示并在循环中运行上面的代码生成5次,这是正确的方法吗?
另外我有时会在最后5个数字中得到相同的数字。
提前致谢。
我尝试过:
Hi Everyone
I am working on a code where I need to generate 5 numbers from a given range (here between 1 to 20).
I could generate one random number as shown below and run the above code in a loop to generate 5 times, is this the right way?
Also I sometimes end up getting same numbers in the final 5 numbers.
Thanks in advance.
What I have tried:
<script type="text/javascript">
$(document).ready(function () {
$('#div').html(Math.floor(Math.random() * 6) + 1);
var arr = [];
for (var i = 0; i < 5; i++)
{
arr.push(Math.floor(Math.random() * 6) + 1)
}
console.log(arr);
});
</script>
推荐答案
( document )。ready( function (){
(document).ready(function () {
(' #div')。html( Math .floor( Math .random( )* 6 )+ 1 );
var arr = [];
for ( var i = 0 ; i< 5 ; i ++)
{
arr.push ( Math .floor( Math .random()* 6 )+ 1 )
}
console .log(arr );
}) ;
< / script>
('#div').html(Math.floor(Math.random() * 6) + 1); var arr = []; for (var i = 0; i < 5; i++) { arr.push(Math.floor(Math.random() * 6) + 1) } console.log(arr); }); </script>
以下代码提取1..20
范围内的五个数字,重复。
The following code extracts five numbers in the1..20
range, without repetitions.
var a = [1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20];
var n;
var r=[];
for (n=1; n<=5; ++n)
{
var i = Math.floor((Math.random() * (20-n)) + 1);
r.push(a[i]);
a[i] = a[20-n];
}
您可以尝试此处 [ ^ ]。
此算法描述如下:从甲板上随机抽取5张卡片[ ^ ]。
You might try it here[^].
The algorithm is described here: Random extraction of 5 cards from a deck[^].
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