random id js

1var ID = function () {
2  // Math.random should be unique because of its seeding algorithm.
3  // Convert it to base 36 (numbers + letters), and grab the first 9 characters
4  // after the decimal.
5  return '_' + Math.random().toString(36).substr(2, 9);
6};

1Math.random().toString(36).slice(2);