Add JS playground in zh_cn (#7596)

* Add JS playground in zh_cn * Format removed slash * Update more/free-programming-playgrounds-zh.md Co-authored-by: David Ordás <3125580+davorpa@users.noreply.github.com> Co-authored-by: David Ordás <3125580+davorpa@users.noreply.github.com>
2022-10-06 00:46:42 +08:00 · 2022-10-06 00:46:42 +08:00 · 9a7e31af99
parent 385c795c80
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--- a/more/free-programming-playgrounds-zh.md
+++ b/more/free-programming-playgrounds-zh.md
@ -1,8 +1,14 @@
 ### Index

 * [Dart](#dart)
+* [JavaScript](#javascript)


 ### Dart

 * [DartPad](https://dartpad.cn)
+
+
+### JavaScript
+
+* [码上掘金](https://code.juejin.cn) - 北京北比信息技术有限公司