JavaScript产生随机数实例代码

<script>
function GetRandomNum(Min,Max){   
  var Range=Max-Min;   
  var Rand=Math.random();   
  return(Min+Math.round(Rand*Range));   
}   
console.log(GetRandomNum(3,20));
</script>

以上函数可以返回大于等于3小于等于20的随机数，代码比较简单，这里就不多介绍了。

再来看一段比较常用的生成随机数的代码:

<script>
var chars=['0','1','2','3','4','5','6','7','8','9','A','B','C','D','E','F','G','H','I','J','K','L','M','N','O','P','Q','R','S','T','U','V','W','X','Y','Z'];
function generateMixed(n){
  var res="";
  for(var i=0;i<n;i++){
    var id=Math.ceil(Math.random()*35);
    res += chars[id];
  }
  return res;
}
console.log(generateMixed(4));
</script>