export default function(n, ch){
var c = "";
if (n == "0" || n == null || !n) n = 10;
if (!ch) ch = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_-";
for (var i = 0; i < parseInt(n); i++){
c += ch.split("")[Math.floor(Math.random() * ch.length)];
}
return c;
};