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slice的结构
type slice struct { array unsafe.Pointer len int cap int }
一个slice结构包含了两个部分: 1. 元数据, 用于描述当前slice的长度,容量以及管理的内存指针位置; 2. 实际内容, 指针指向的内存区域; 函数调用的时候两种方式的区别
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