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18.3 映射
创建： `map1 := make(map[keytype]valuetype)`
初始化: `map1 := map[string]int{"one": 1, "two": 2}`
（1）如何使用for或者for-range遍历一个映射：
for key, value := range map1 {
…
}
（2）如何在一个映射中检测键key1是否存在：
`val1, isPresent = map1[key1]`
返回值: 键`key1`对应的值或者`0`, `true`或者`false`
（3）如何在映射中删除一个键：
`delete(map1, key1)`