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众所周知，golang中map是一个指针，既然是一个指针，那么参数传递、赋值应该都是指针传递，而下面的例子也印证了我的想法

package mainimport "fmt"func test_map2(m map[string]string) {fmt.Printf("inner: %v, %p, %p\n", m, m, &m)m = make(map[string]string, 0)m["a"] = "11"fmt.Printf("inner: %v, %p, %p\n", m, m, &m)
}func main() {// var m map[string]string //未初始化m := make(map[string]string)fmt.Printf("outer: %v, %p, %p\n", m, m, &m)test_map2(m)fmt.Printf("outer: %v, %p, %p\n", m, m, &m)n := mfmt.Printf("outer: %v, %p, %p\n", n, n, &n)
}

输出

outer: map[], 0xc0000160f0, 0xc000042020
inner: map[], 0xc0000160f0, 0xc000042030
inner: map[a:11], 0xc000016180, 0xc000042030
outer: map[], 0xc0000160f0, 0xc000042020
outer: map[], 0xc0000160f0, 0xc000042038