diary on Jun 20.

diary.js

@@ -0,0 +1,36 @@
+const DATA = new Date(2019, 6, 20);
+const WEATHER = "sunny";
+const LOCATION = "shenzhen";
+
+class Dirkwei {
+  constructor(name) {
+    if (!Dirkwei.instance) {
+      this.name = name;
+      this.todoList = [];
+      Dirkwei.instance = this;
+    }
+    return Dirkwei.instance;
+  }
+
+  cookAfterWork(food) {
+    console.log(`${this.name} make ${food}`);
+    return this;
+  }
+
+  addTempThingsTodo(...fncs) {
+    this.todoList.push(...fncs);
+  }
+
+  finishTodoList() {
+    this.todoList.forEach(task => task());
+  }
+}
+
+Dirkwei.instance = undefined;
+
+const me = new Dirkwei("dirkwei");
+me.addTempThingsTodo(
+  () => console.log("read PHP code"),
+  () => console.log("finish my homework.")
+);
+me.cookAfterWork("fried dumplings").finishTodoList();