golang

    for _, v := range resultObjects {
        sd, exist := m[v.Endpoint]
        if !exist {
                        sd := new(SavedData) // sd = new(SavedData)
            sd.Ip = v.Endpoint
            sd.StartTime = time.Unix(start, 0)
            sd.EndTime = time.Unix(end, 0)

            m[v.Endpoint] = sd
        }
        ...
            ...
                ...

        sd.CpuMax = float64(max)
        sd.CpuMin = min

        m[v.Endpoint] = sd
    }

跑这段代码会出现这个问题：

panic: runtime error: invalid memory address or nil pointer dereference

因为忽略了作用域

golang

原文：https://www.cnblogs.com/zhouj-happy/p/11049896.html