Update issue-1.md

nieshuangyan · web-flow · commit f0bebbac28e5 · 2020-12-02T08:37:11.000+08:00
diff --git a/docs/issue-1.md b/docs/issue-1.md
@@ -156,4 +156,5 @@ f3()
 我是f函数
 ```
 
-
+## 参考
+[并发模型与事件循环](https://developer.mozilla.org/zh-CN/docs/Web/JavaScript/EventLoop)
