golang silces声明错误导致的空指针

make(type,len,cap)make(type,len)

players := make([]*Player,1)

这样就相当于初始化了一个如下的切片。

players = []*Player{nil}

如果添加一个数据

players = append(players,NewPlayer("小王"))

则会在nil后面附加上这个NewPlayer(“小王”)

players = []*Player{nil,&Player{name:"小王"}}

当需要遍历这个players切片，去调用具体函数时，此时由于players第一个元素为初始化的nil，用它调用函数则会出现空指针

for _,p := range players {
	p.DoSomeThing()
}