Js生成隨機數 生成隨機字符串的5種方法

第一種：使用randomString，e表示長度，默認32位

function randomString(e) {    
    e = e || 32;
    var t = "ABCDEFGHJKMNPQRSTWXYZabcdefhijkmnprstwxyz2345678",
    a = t.length,
    n = "";
    for (i = 0; i < e; i++) n += t.charAt(Math.floor(Math.random() * a));
    return n
}
alert(randomString(6));

第二種：生成隨機數

// 本例子表明生成100000-999999的隨機數
function GetRandomNum(Min,Max)
{
var Range = Max - Min;
var Rand = Math.random();
return(Min + Math.round(Rand * Range));
}
var num = GetRandomNum(10000,999999);
alert(num);

第三種：對定義的數組字符集進行隨機選取

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;
}
alert(generateMixed(6));

第四種：生成隨機數轉成36進制，再截取部分

//Math.random() 生成隨機數字, eg: 0.123456
//.toString(36) 轉化成36進制 : "0.4fzyo82mvyr"
//.slice(-8); 截取最後八位 : "yo82mvyr"
var str = Math.random().toString(36).slice(-6);
alert(str);

第五種：對字符串集合隨機排列，隨機輸出指定的長度

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;
}
alert(randomString(6));

Author:TANKING
Date:2020-05-22
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