在JavaScript中生成一个随机的字母数字(大写，小写和数字)字符串来用作可能唯一的标识符的最短方法是什么?
当前回答
我认为以下是允许给定长度的最简单的解决方案:
Array(myLength).fill(0).map(x => Math.random().toString(36).charAt(2)).join('')
这取决于箭头函数的语法。
其他回答
我认为以下是允许给定长度的最简单的解决方案:
Array(myLength).fill(0).map(x => Math.random().toString(36).charAt(2)).join('')
这取决于箭头函数的语法。
32个字符:
for(var c = ''; c.length < 32;) c += Math.random().toString(36).substr(2, 1)
我只是发现了一个非常好的优雅的解决方案:
Math.random().toString(36).slice(2)
这个实现的注意事项:
This will produce a string anywhere between zero and 12 characters long, usually 11 characters, due to the fact that floating point stringification removes trailing zeros. It won't generate capital letters, only lower-case and numbers. Because the randomness comes from Math.random(), the output may be predictable and therefore not necessarily unique. Even assuming an ideal implementation, the output has at most 52 bits of entropy, which means you can expect a duplicate after around 70M strings generated.
var randomString = function(length) {
var str = '';
var chars ='0123456789ABCDEFGHIJKLMNOPQRSTUVWXTZabcdefghiklmnopqrstuvwxyz'.split(
'');
var charsLen = chars.length;
if (!length) {
length = ~~(Math.random() * charsLen);
}
for (var i = 0; i < length; i++) {
str += chars[~~(Math.random() * charsLen)];
}
return str;
};
使用md5库:https://github.com/blueimp/JavaScript-MD5
最短的方法:
md5(随机数学。()
如果你想限制大小为5:
md5 (math . random())。substr (0, 5)
