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| // 复制一个 slice
s2 := s1[:2]
fmt.Printf("s2(%p): %v, len: %d, cap: %d\n", &s2, s2, len(s2), cap(s2))
// s2(0xc00000c120): [1 3], len: 2, cap: 4s1[0] = 10 // 这里可以发现，s1[0] s2[0] 都被修改为了 10
fmt.Printf("s1(%p): %v, len: %d, cap: %d\n", &s1, s1, len(s1), cap(s1))
// s1(0xc00000c080): [10 3], len: 2, cap: 4
fmt.Printf("s2(%p): %v, len: %d, cap: %d\n", &s2, s2, len(s2), cap(s2))
// s2(0xc00000c120): [10 3], len: 2, cap: 4 s1 = append(s1, 5, 6, 7, 8)
s1[0] = 11 // 这里可以发现，s1[0] 被修改为了 11, s2[0] 还是10
fmt.Printf("s1(%p): %v, len: %d, cap: %d\n", &s1, s1, len(s1), cap(s1))
// s1(0xc00011c020): [11 3 5 6 7 8], len: 6, cap: 8
fmt.Printf("s2(%p): %v, len: %d, cap: %d\n", &s2, s2, len(s2), cap(s2))
// s2(0xc00011c0c0): [10 3], len: 2, cap: 4
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