[..."abcdefghijklmnopqrsuvwxyz0123456789"].map((e, i, a) => a[Math.floor(Math.random() * a.length)]).join('')

我已经制作了一个字符串原型，它可以生成一个给定长度的随机字符串。

如果你想要特殊字符，你也可以解密，你可以避免一些。

/**
 * STRING PROTOTYPE RANDOM GENERATOR
 * Used to generate a random string
 * @param {Boolean} specialChars
 * @param {Number} length
 * @param {String} avoidChars
 */
String.prototype.randomGenerator = function (specialChars = false, length = 1, avoidChars = '') {
    let _pattern = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789';
    _pattern += specialChars === true ? '(){}[]+-*/=' : '';
    if (avoidChars && avoidChars.length) {
        for (let char of avoidChars) {
            _pattern = _pattern.replace(char, '');
        }
    }
    let _random = '';
    for (let element of new Array(parseInt(length))) {
        _random += _pattern.charAt(Math.floor(Math.random() * _pattern.length));
    }
    return _random;
};

您可以这样使用：

// Generate password with specialChars which contains 10 chars and avoid iIlL chars
var password = String().randomGenerator(true, 10, 'iIlL');

希望有帮助。

将字符作为thisArg放在map函数中会创建一个“单行”：

Array.apply(null, Array(5))
.map(function(){ 
    return this[Math.floor(Math.random()*this.length)];
}, "abcdefghijklmnopqrstuvwxyz")
.join('');

这是肯定的

<script language="javascript" type="text/javascript">
function randomString() {
 var chars = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXTZabcdefghiklmnopqrstuvwxyz";
 var string_length = 8;
 var randomstring = '';
 for (var i=0; i<string_length; i++) {
  var rnum = Math.floor(Math.random() * chars.length);
  randomstring += chars.substring(rnum,rnum+1);
 }
 document.randform.randomfield.value = randomstring;
}
</script>

函数randomstring（L）{var s=“”；var randomchar=函数（）{var n=数学地板（Math.random（）*62）；如果（n<10）返回n//1-10如果（n<36）返回String.fromCharCode（n+55）//A-Z型return String.fromCharCode（n+61）//a-z型}而（s.length<L）s+=randomchar（）；返回s；}console.log（随机字符串（5））；

在下面的代码中，我正在生成8个字符的随机代码

function RandomUnique(){
                    var charBank = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ012346789";
                    var random= '';
                    var howmanycharacters = 8;
                    for (var i = 0; i < howmanycharacters ; i++) {
                        random+= charBank[parseInt(Math.random() * charBank.lenght)];
                    }
                    return random;
                }
        var random = RandomUnique();
        console.log(random);