在JavaScript中生成随机字符串/字符

我想要一个5个字符的字符串，由从集合[a-zA-Z0-9]中随机选取的字符组成。

用JavaScript实现这一点的最佳方法是什么？

当前回答

function generate(length) {
  var letters = ["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","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","0","1","2","3","4","5","6","7","8","9"];
  var IDtext = "";
  var i = 0;
  while (i < length) {
    var letterIndex = Math.floor(Math.random() * letters.length);
    var letter = letters[letterIndex];
    IDtext = IDtext + letter;
    i++;
  }
  console.log(IDtext)
}

2020-08-08 23:50:20

其他回答

试试这个，我每次都用的：

函数myFunction（）{var hash=“abcdefghijklmnopqrstuvxyzABCDEFGHIJKLMNOPQRSTUVWXYZ012346789”；var random8=“”；对于（变量i=0；i<5；i++）{random8+=哈希[parseInt（Math.random（）*hash.length）]；}控制台日志（random8）；document.getElementById（“demo”）.innerHTML=“您的5个字符串==>”+random8；} <!DOCTYPE html><html><body><p>单击按钮生成5个字符的随机字符串</p＞<button onclick=“myFunction（）”>单击我</button><p id=“demo”></p></body></html>

2017-06-24 10:29:36

您可以使用base64：

function randomString(length)
{
    var rtn = "";

    do {
        rtn += btoa("" + Math.floor(Math.random() * 100000)).substring(0, length);
    }
    while(rtn.length < length);

    return rtn;
}

2018-04-08 08:53:59

下面这个怎么样。。。这将产生真正随机的值：

function getRandomStrings(length) {
  const value = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789';
  const randoms = [];
  for(let i=0; i < length; i++) {
     randoms.push(value[Math.floor(Math.random()*value.length)]);
  }
  return randoms.join('');
}

但如果您在ES6中寻找一个较短的语法：

const getRandomStrings = length => Math.random().toString(36).substr(-length);

2019-01-29 12:48:34

加密强

如果您想获得满足您要求的加密强字符串（我看到的答案使用了这个，但给出了无效答案），请使用

let pass = n=> [...crypto.getRandomValues(new Uint8Array(n))]
   .map((x,i)=>(i=x/255*61|0,String.fromCharCode(i+(i>9?i>35?61:55:48)))).join``

let pass=n=>[…crypto.getRandomValues（新Uint8Array（n））].map（（x，i）=>（i=x/255*61|0，String.fromCharCode（i+（i>9？i>35？61:55:48）））.join``console.log（通过（5））；

更新：感谢Zibri评论，我更新代码以获得任意长密码

2020-06-21 20:54:31

带有es6排列运算符的更新版本：

[…数组（30）].map（（）=>Math.random（）.toString（36）[2]）.join（“”）

30是一个任意数字，您可以选择所需的任何令牌长度36是可以传递给numeric.toString（）的最大基数，表示所有数字和a-z小写字母2用于从如下所示的随机字符串中选择第三个索引：“0.mfbiohx64i”，我们可以取0之后的任何索引。

2017-11-26 13:17:19

在JavaScript中生成随机字符串/字符

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