Update index.md (javascript-tutorial#102)

leviding · web-flow · commit 51ceaf29637a · 2018-05-30T17:49:59.000+08:00
* Update index.md

* Update index.md
diff --git a/1-js/index.md b/1-js/index.md
@@ -1,6 +1,5 @@
-# The JavaScript language
+# JavaScript 编程语言
 
-Here we learn JavaScript, starting from scratch and go on to advanced concepts like OOP.
-
-We concentrate on the language itself here, with the minimum of environment-specific notes.
+在这儿我们将从头开始学习 JavaScript，也会学习 OOP 等相关高级概念。
 
+因为不同环境会导致程序运行结果不同，为了避免歧义，专注于语言本身。在这儿我们默认使用最小环境。
