切片的坑特别多

``````` testList := []uint16{1, 2, 3, 4} myTest := testList //1.mytest 和 testList指向同一段 myTest = append(myTest, 9) //分离指向,所以在设计的时候最好给一个cap，不需要频繁的开辟内存 fmt.Println(testList) ```````