指针
随写
Go语言中的函数传参都是值拷贝
类型指针不能进行偏移和运算
当一个指针被定义后没有分配到任何变量时，它的值为 nil
引用类型的变量使用时不仅需要声明还需要分配内存空间
new与make
- 用于分配内存
- make只用于slice、map以及channel的初始化，返回的还是这三个引用类型本身
- new用于类型的内存分配，并且内存对应的值为类型零值，返回的是指向类型的指针
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