JavaScriptは乱数を生成する4種類のカスタム関数を共有します.

/*
*@desc:       
*@remark:toString                 ，     2 36  。     ，     10  
*/
function generateRandomAlphaNum(len) {
  var rdmString = "";
  for (; rdmString.length < len; rdmString += Math.random().toString(36).substr(2));
  return rdmString.substr(0, len);
}

//JS  GUID  ,  .net  NewID(); 
function S4() {
  return (((1 + Math.random()) * 0x10000) | 0).toString(16).substring(1);
}

function NewGuid() {
  return (S4() + S4() + "-" + S4() + "-" + S4() + "-" + S4() + "-" + S4() + S4() + S4());
}

//JS  GUID  ,  .net  NewID(); 
function newGuid() {
  var guid = "";
  for (var i = 1; i <= 32; i++) {
    var n = Math.floor(Math.random() * 16.0).toString(16);
    guid += n;
    if ((i == 8) || (i == 12) || (i == 16) || (i == 20))
      guid += "-";
  }
  return guid;
}

/*
*@desc:       
*@demo:console.log(ranStr());
*/
;(function(){
  //  0-9，    ，    ，ASCII UNICODE  （   ）， 62 
  var charCodeIndex = [[48,57],[65,90],[97,122]];
  var charCodeArr = [];

  function getBetweenRound(min,max){
    return Math.floor(min+Math.random()*(max-min));
  };

  function getCharCode(){
    for(var i=0,len=3;i