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//字面量初始化
hash1 := map[string]int{
    "1": 2,
    "3": 4,
    "5": 6,
}
//make初始化
hash2 := make(map[string]int, 3)
hash2["1"] = 2
hash2["3"] = 4
hash2["5"] = 6

//取值
_ = hash1[key]

//for 遍历
for k, v := range hash2 {
    // k, v
}

// delete
hash1[key] = value
hash1[key] = newValue
delete(hash, key)

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type hmap struct {
    count     int
    flags     uint8
    B         uint8
    noverflow uint16
    hash0     uint32

    buckets    unsafe.Pointer
    oldbuckets unsafe.Pointer
    nevacuate  uintptr

    extra *mapextra
}

type mapextra struct {
    overflow    *[]*bmap
    oldoverflow *[]*bmap
    nextOverflow *bmap
}
type bmap struct {
    topbits  [8]uint8
    keys     [8]keytype
    values   [8]valuetype
    pad      uintptr
    overflow uintptr
}