fix 容量超1的问题

README.md

@@ -2,7 +2,7 @@
 [![Badge](https://img.shields.io/badge/link-996.icu-%23FF4D5B.svg?style=flat-square)](https://996.icu/#/zh_CN)
 [![Go](https://github.com/WeiJiadong/gocache/workflows/Go/badge.svg?branch=master)](https://github.com/WeiJiadong/gocache/actions)
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-[![GoDoc](https://godoc.org/github.com/WeiJiadong/gocache?status.svg)](https://pkg.go.dev/github.com/WeiJiadong/[email protected].2)
+[![GoDoc](https://godoc.org/github.com/WeiJiadong/gocache?status.svg)](https://pkg.go.dev/github.com/WeiJiadong/[email protected].7)
 [![Latest](https://img.shields.io/badge/latest-v1.1.2-blue.svg)](https://github.com/WeiJiadong/gocache/tree/v1.1.2)
 [![codecov](https://codecov.io/gh/WeiJiadong/gocache/branch/master/graph/badge.svg?token=6RG0W91RF2)](https://codecov.io/gh/WeiJiadong/gocache)
 [![License](https://img.shields.io/badge/License-Apache_2.0-blue.svg)](https://opensource.org/licenses/Apache-2.0)

cache.go

@@ -57,16 +57,16 @@ func (c *Cache) Set(key, val interface{}) error {
 		oldVal.Value.(*elem).expire = time.Now().Add(c.opts.expire).UnixNano()
 		return nil
 	}
-	// 2 key不存在，则直接在最前面插入一个值，并更新map
-	c.data[key] = c.lru.PushFront(&elem{key: key, value: val, expire: time.Now().Add(c.opts.expire).UnixNano()})
-	// 3 判断是否到达容量限制，若达到限制，则进行LRU剔除
-	if c.opts.keyCnt > 0 && c.lru.Len() > c.opts.keyCnt {
+	// 2 先判断是否到达容量限制，若达到限制，则进行LRU剔除
+	if c.opts.keyCnt > 0 && c.lru.Len() >= c.opts.keyCnt {
 		if lruVal := c.lru.Back(); lruVal != nil {
 			c.lru.Remove(lruVal)
 			v := lruVal.Value.(*elem)
 			delete(c.data, v.key)
 		}
 	}
+	// 3 key不存在，则直接在最前面插入一个值，并更新map
+	c.data[key] = c.lru.PushFront(&elem{key: key, value: val, expire: time.Now().Add(c.opts.expire).UnixNano()})
 	return nil
 }