声明:
源slice= src
添加slice = app
结果slice=tar
append时
len tar === len src + len app
1）如果len(src) + len(app) <= cap(src) cap tar = cap(src)
2）否则
a) len(src) + len(app) > 2* cap(src) cap tar = len(src) + len(app)
b) cap(src) < len(src) + len(app) <= 2* cap(src) cap tar = 2* cap(src)
data := make([]int, 10, 20)
data[0] = 1
data[1] = 2
dataappend := make([]int, 12, 30)//修改这个len
dataappend[0] = 1
dataappend[1] = 2
result := append(data, dataappend)
result[0] = 99
result[11] = 98
fmt.Println("length:", len(data), "cap:", cap(data), ":", data)
fmt.Println("result length:", len(result), "cap:", cap(result), ":", result)
fmt.Println("length:", len(dataappend), "cap:", cap(dataappend), ":", dataappend)
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