function?testCode(n){
????var?arr=?[];
????for(var?i?=?1?;?i?<=?n?;?i++){
????????var?num?=?parseInt(Math.random()?*?123);
????????if(num?<=?9){
????????????arr.push(num);
????????}else?if((num?>=?65?&&?num?<=?90)?||?(num?>=?97?&&?num?<=?122)){
????????????arr.push(String.fromCharCode(num));
????????}else{
????????????i--
????????}??????????????
????}
????return?arr.join("");
}
alert(test(6));
?//純數(shù)字驗證碼
??function?test(n){
????var?arr?=?[];
????for(var?i?=?1?;?i?<=?n?;?i++){
????????var?num?=?parseInt(Math.random()?*?10);
????????arr.push(num);
????}
????return?arr.join('');
}
alert(test(4));
