Update：补充内容

source/c01/c01_10.md

@@ -164,6 +164,27 @@ hello, python
 hello, go
 ```
 
+如果你用一个变量来接收的话，接收到的是索引
+
+```go
+import "fmt"
+
+func main() {
+	myarr := [...]string{"world", "python", "go"}
+	for i := range myarr {
+		fmt.Printf("hello, %v\n", i)
+	}
+}
+```
+
+输出如下
+
+```
+hello, 0
+hello, 1
+hello, 2
+```
+
 
 
 ---