randomString method
Generates a random string of provided or random length. 生成指定长度或随机长度的随机字符串
Implementation
String randomString({int? length}) {
var codeUnits = List.generate(length ?? _random.nextInt(pow(2, 10).toInt()), (index) {
return _random.nextInt(33) + 89;
});
return String.fromCharCodes(codeUnits);
}