diff --git a/ebook/07.2.md b/ebook/07.2.md
index ffde04df0..4d19e3961 100644
--- a/ebook/07.2.md
+++ b/ebook/07.2.md
@@ -88,6 +88,8 @@ JSON（Javascript Object Notation）是一种轻量级的数据交换语言，
 			fmt.Println(k, "is string", vv)
 		case int:
 			fmt.Println(k, "is int", vv)
+		case float64:
+			fmt.Println(k,"is float64",vv)
 		case []interface{}:
 			fmt.Println(k, "is an array:")
 			for i, u := range vv {