利用javascript如何随机生成一定位数的密码

前言

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需求

随机生成一定位数的密码，有最小个数和最大个数，必须包含数字、大小写字母，和特殊字符比如（- _ #）；

代码

function createpassword(min,max) {
 //可以生成随机密码的相关数组
 var num = ["0","1","2","3","4","5","6","7","8","9"];
 var english = ["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"];
 var english = ["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"];
 var special = ["-","_","#"];
 var config = num.concat(english).concat(english).concat(special);

 //先放入一个必须存在的
 var arr = [];
 arr.push(getone(num));
 arr.push(getone(english));
 arr.push(getone(english));
 arr.push(getone(special));

 //获取需要生成的长度
 var len = min + math.floor(math.random()*(max-min+1));

 for(var i=4; i<len; i++){
  //从数组里面抽出一个
  arr.push(config[math.floor(math.random()*config.length)]);
 }

 //乱序
 var newarr = [];
 for(var j=0; j<len; j++){
  newarr.push(arr.splice(math.random()*arr.length,1)[0]);
 }

 //随机从数组中抽出一个数值
 function getone(arr) {
  return arr[math.floor(math.random()*arr.length)];
 }

 return newarr.join("");
 }

使用

传入一个生成的密码的最小位数，和最大位数，即可返回一个随机密码

console.log(createpassword(8,15));

总结

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