javascript创建含数字字母的随机字符串方法总结

第一种：

//code from http://caibaojian.com/js-random-string.htmlfunction makeid(){  var text = "";  var possible = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789";  for( var i=0; i < 5; i++ )    text += possible.charAt(Math.floor(Math.random() * possible.length));  return text;}

第二种：不需要输入字符集合

function randomstring(L){  var s= '';  var randomchar=function(){   var n= Math.floor(Math.random()*62);   if(n<10) return n; //1-10   if(n<36) return String.fromCharCode(n+55); //A-Z   return String.fromCharCode(n+61); //a-z  }  while(s.length< L) s+= randomchar();  return s;}

alert(randomstring(5))

第三种：支持自定义字符长度和特征字符集合

function randomString(len, charSet) {  charSet = charSet || 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789';  var randomString = '';  for (var i = 0; i < len; i++) {   var randomPoz = Math.floor(Math.random() * charSet.length);   randomString += charSet.substring(randomPoz,randomPoz+1);  }  return randomString;}

Call with default charset [a-zA-Z0-9] or send in your own:

var randomValue = randomString(5);var randomValue = randomString(5, 'PICKCHARSFROMTHISSET');

演示截图

以上就是javascript创建含数字字母的随机字符串的三种方法总结，有需要的可以参考学习。