Go rand.Intn相同的数字/值

问题描述

任何人都可以在这里告诉我为什么使用Go示例吗?

Can anyone please tell me why the Go example here:

https://tour.golang.org/basics/1

是否总是为rand.Intn(10)返回相同的值?

always returns the same value for rand.Intn(10)?

推荐答案

2个原因:

1. 您必须初始化由 Source a href ="https://golang.org/pkg/math/rand/#Intn" rel ="noreferrer"> rand.Intn() 和rand包的其他功能，使用 rand.Seed() .例如:

1. You have to initalize the global Source used by rand.Intn() and other functions of the rand package using rand.Seed(). For example:

rand.Seed(time.Now().UnixNano())

请参阅 Go Rand软件包存在的困难.
引用 rand 的软件包文档:

See possible duplicate of Difficulty with Go Rand package.
Quoting from package doc of rand:

旅游在转到游乐场，该缓存会缓存其输出.
请参阅.

The Tour runs examples on the Go Playground which caches its output.
See details at Why does count++ (instead of count = count + 1) change the way the map is returned in Golang.

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