生成给定长度的随机字符串

Question

我这里有一些问题。

a）我想设置3-8个字符，但它只显示3个字符。

b）我想有三个输出具有不同的显示时间。我只是nid创建不同的Id？

有人可以帮忙吗？这段代码出了什么问题？谢谢。

使用Javascript

        function randomString(Length)
        {
        if(Length < 3) Length = 3;
        if(Length > 8) Length = 8;
            var text = "";
            var possible = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
            for( var i=0; i < Length; i++ )
                text += possible.charAt(Math.floor(Math.random() * possible.length));

            return text;
        }

        function ChangingRandomString(Length)
        {
            setInterval(function(){document.getElementById("random").style.fontSize = Math.floor((Math.random() * 20) + 10)+"px",
                document.getElementById("random").innerHTML = randomString(Length);
            },2000);
        }

Answer 1

function randomString(length) {
  if (length < 3) length = 3;
  if (length > 8) length = 8;
  var text = '';
  var possible = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ';
  for (var i = 0; i < length; i++) {
    text += possible[Math.floor(Math.random() * possible.length)];
  }
  return text;
}

function ChangingRandomString(length) {
  setInterval(() => {
    let el = document.getElementById('random');
    el.style.fontSize = Math.floor(Math.random() * 20 + 10) + 'px';
    el.innerHTML = randomString(length);
  }, 2000);
}

ChangingRandomString(length);

<div id="random"></div>

Answer 2

function randomString(length){
    if(length<5) length =5;
  if(length>8) length =8;
            var text = "";
      var possible = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
      for(let i=0;i<=length;i++){
            text +=possible[Math.floor(Math.random()*possible.length)]
      }
      return text
}

function string(length){
    setInterval(() => {
            console.log(randomString(length));
        },2000);
}

string(5);