Reference

• 理解Golang哈希表的原理： https://juejin.cn/post/6844903793927143438
• golang哈希表： https://draveness.me/golang/docs/part2-foundation/ch03-datastructure/golang-hashmap/
• golang的for-range(哈希表的遍历): https://draveness.me/golang/docs/part2-foundation/ch05-keyword/golang-for-range/