/*＜メモ＞
mからnの整数を得る　Math.floor((n-m+1)*Math.random()+m)。
an：配列
$num：0から36の乱数
$result：乱数から得る "a" から "z"　及び　"0" から "9"　の値。
*/

/*配列an[0]からan[36]にアルファベットと数字を代入*/
var an = new Array("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","0","1","2","3","4","5","6","7","8","9");
var i;
for (i=0;i<36;i++){
}

/*４桁のパスワードを作る*/
document.write("<br>","　４桁のパスワード：");
var $num;
var i;
for (i = 0; i < 4; i++) { 
$num = Math.floor(36*Math.random());
var $result;
$result = an[$num];
document.write($result); //$resultを出力
}

/*８桁のパスワードを作る*/
document.write("<br>","　８桁のパスワード：");
var $num;
var i;
for (i = 0; i < 8; i++) { 
$num = Math.floor(36*Math.random());
var $result;
$result = an[$num];
document.write($result); //$resultを出力
}

/*１２桁のパスワードを作る*/
document.write("<br>","１２桁のパスワード：");
var $num;
var i;
for (i = 0; i < 12; i++) { 
$num = Math.floor(36*Math.random());
var $result;
$result = an[$num];
document.write($result); //$resultを出力
}