first commit

历届学生/font-end-nine/项目练习/学生项目/刘正阳/每日练习/水管鸟游戏/js/utils.js

@@ -0,0 +1,29 @@
+class Util {
+
+    inject() {
+        Element.prototype.remove = function (removeClassName) {
+            this.classList.remove(removeClassName);
+        }
+        Element.prototype.add = function (addClassName) {
+            this.classList.add(addClassName);
+        }
+    }
+
+    click(className,callback) {
+        $(className).onclick = () => {
+            callback()
+        }
+    }
+
+    $(className) {
+        return document.querySelector(className)
+    }
+
+    _(className) {
+        return document.querySelectorAll(className)
+    }
+}
+
+var { $, _, click, inject } = new Util()
+
+inject()