diff --git a/example06/src/core/Component.js b/example06/src/core/Component.js
index c218bde..b014dec 100644
--- a/example06/src/core/Component.js
+++ b/example06/src/core/Component.js
@@ -18,10 +18,8 @@ export default class Component {
     this.render();
   }
   addEvent (eventType, selector, callback) {
-    const children = [ ...this.$target.querySelectorAll(selector) ];
-    const isTarget = (target) => children.includes(target) || target.closest(selector);
     this.$target.addEventListener(eventType, event => {
-      if (!isTarget(event.target)) return false;
+      if (!event.target.closest(selector)) return false;
       callback(event);
     })
   }
diff --git a/example07/src/core/Component.js b/example07/src/core/Component.js
index c218bde..b014dec 100644
--- a/example07/src/core/Component.js
+++ b/example07/src/core/Component.js
@@ -18,10 +18,8 @@ export default class Component {
     this.render();
   }
   addEvent (eventType, selector, callback) {
-    const children = [ ...this.$target.querySelectorAll(selector) ];
-    const isTarget = (target) => children.includes(target) || target.closest(selector);
     this.$target.addEventListener(eventType, event => {
-      if (!isTarget(event.target)) return false;
+      if (!event.target.closest(selector)) return false;
       callback(event);
     })
   }
diff --git a/example08/src/core/Component.js b/example08/src/core/Component.js
index f009276..67f1591 100644
--- a/example08/src/core/Component.js
+++ b/example08/src/core/Component.js
@@ -22,10 +22,8 @@ export default class Component {
     this.render();
   }
   addEvent (eventType, selector, callback) {
-    const children = [ ...this.$target.querySelectorAll(selector) ];
-    const isTarget = (target) => children.includes(target) || target.closest(selector);
     this.$target.addEventListener(eventType, event => {
-      if (!isTarget(event.target)) return false;
+      if (!event.target.closest(selector)) return false;
       callback(event);
     })
   }