From 6dcc864d9eac4aab4dca79e18c3ee650dc45681a Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E5=85=89=E5=AD=90?= <kuuyee@gmail.com>
Date: Tue, 29 Sep 2015 23:18:58 +0800
Subject: [PATCH] =?UTF-8?q?=E5=AE=8C=E6=88=9012.7=E7=AB=A0=E8=8A=82?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 eBook/12.7.md | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)
 create mode 100644 eBook/12.7.md

diff --git a/eBook/12.7.md b/eBook/12.7.md
new file mode 100644
index 0000000..79323e2
--- /dev/null
+++ b/eBook/12.7.md
@@ -0,0 +1,21 @@
+# 用defer关闭文件
+
+`defer`关键字(参看6.4)对于在函数结束时关闭打开的文件非常有用，例如下面的代码片段：
+
+```go
+func data(name string) string {
+	f := os.Open(name, os.O_RDONLY, 0)
+	defer f.Close() // idiomatic Go code!
+	contents := io.ReadAll(f)
+	return contents
+}
+
+```
+在函数return时执行了`f.Close()`
+
+
+## 链接
+
+- [目录](directory.md)
+- 上一节：[用切片读写文件](12.6.md)
+- 下一节：[一个使用接口的实际例子:fmt.Fprintf](12.8.md)