void Start()
{
    System.Random random = new System.Random();
    for (int i = 0; i < 10; i++)
    {
       Debug.Log(GetRandomNumber(random,3.14, 4.54, 2));
    }
 }   

    /// <summary>
    /// 在一定范围内生成随机小数
    /// </summary>
    /// <param name="random"></param>
    /// <param name="minimum">最小值</param>
    /// <param name="maximum">最大值</param>
    /// <param name="Len">保留小数点位数</param>
    /// <returns></returns>
    public double GetRandomNumber(System.Random random,double minimum, double maximum, int Len)
    {
        lock (random)
        {
            return Math.Round(random.NextDouble() * (maximum - minimum) + minimum, Len);
        }
        
    }

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