randomSize static method

String randomSize(
  1. int size
)

Implementation

static String randomSize(int size) {
  String str =
      'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789';
  Random random = Random();
  //指定字符串长度，拼接字符
  String string = '';
  for (int i = 0; i < size; i++) {
    //获取指定长度的字符串中任意一个字符的索引值
    int number = random.nextInt(str.length);
    //根据索引值获取对应的字符
    string += str[number];
  }
  return string;
}