Use js to generate a list of random lottery numbers_javascript skills

The friend said his friend shouted the question. Lottery shop, I want to print out a list.

There are 22 balls numbered 1-22. Take 5 out randomly. Do not put it back after taking it out.

For example, the first time I took out the number 5, the second time I took it from the remaining 21 balls. And so on, a total of 5 balls are taken out.

Take out the last 5 balls, regardless of the order in which they are arranged. That is to say, if you take out 1 2 3 4 5 and 5 4 3 2 1, they are the same number. You can only print out the list once

Finally print out all the results. What he called a simple permutation and combination problem involved some operations on arrays. I was temporarily confused and couldn't think about it.

Let’s see if there is anyone who can answer the question and provide some more convenient algorithms. Thank you very much

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]<script> var a=[] var b=[] var n for(var i=1;i<23;i++) a.push(i<10 ? "0"+i : i) for(var i=0;i<5;i++) { n = a.splice(Math.floor(Math.random() * a.length),1) alert("抽出: "+ n) b.push(n) } alert("共抽出 : "+b.sort()+" 还剩 : "+a) </script>