くらへ！ - LCG

(function(){
var suc = function(v){return (v*555555555555556+277)%999999999999999;};

$y = {};
$y.random = function(r, s){
  if(!s) s = (new Date()).getTime();
  var a = new Array(r);
  for(var i=0; i<r; i++){
    s = suc(s);
    a[i] = s / 1e+15;
  }
  return a;
};
})();

だが速度がNativeの5倍？