JS生成随机数随机字符串的5种方法小结

1、第⼀种：使⽤randomString，e表⽰长度，默认32位

function randomString(e) { var e = e || 32,

t = \"ABCDEFGHJKMNPQRSTWXYZabcdefhijkmnprstwxyz2345678\", a = t.length, n = \"\";

for (i = 0; i < e; i++) n += t.charAt(Math.floor(Math.random() * a)); return n}

randomString(6);2、⽣成随机数：

　　原理是随机数和最⼤值减最⼩值的差相乘，最后再加上最⼩值// 代表⽣成100000-999999的随机数function GetRandomNum(Min,Max){ var Range = Max - Min; var Rand = Math.random();

return (Min + Math.round(Rand * Range));}

GetRandomNum(10000,999999);3、对定义的数组字符集进⾏随机选取

var str = ['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 += str[id]; }

return res;}

generateMixed(6);

4、⽣成随机数转成36进制，再截取部分//Math.random() ⽣成随机数字, eg: 0.123456//.toString(36) 转化成36进制 : \"0.4fzyo82mvyr\"//.slice(-8); 截取最后⼋位 : \"yo82mvyr\"

var str = Math.random().toString(36).slice(-6);5、对字符串集合随机排列，随机输出指定的长度

function randomString(length) {

var str = '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ'; var result = '';

for (var i = length; i > 0; --i) {

result += str[Math.floor(Math.random() * str.length)];　}

　return result;}

randomString(6);