getRandom static method
生成固定长度的随机字符串
Implementation
static String getRandom(int num) {
String alphabet = 'qwertyuiopasdfghjklzxcvbnmQWERTYUIOPASDFGHJKLZXCVBNM';
String left = '';
for (var i = 0; i < num; i++) {
// right = right + (min + (Random().nextInt(max - min))).toString();
left = left + alphabet[Random().nextInt(alphabet.length)];
}
return left;
}