随机数

NSInteger RandomValue(int fromValue, int toValue) {
	NSInteger randomValue = arc4random() % (toValue - fromValue + 1) + fromValue;
	return randomValue;
}
/// 随机数 [0, to]
NSInteger RandomToValue(int toValue) {
	NSInteger randomValue = arc4random() % (toValue + 1);
	return randomValue;
}