diff --git a/lib/index.js b/lib/index.js
index 8d2deb0..aa27f7e 100644
--- a/lib/index.js
+++ b/lib/index.js
@@ -2,15 +2,37 @@
 
   class Delegator {
     constructor (selector/* root选择器 */) {
-      // TODO
+	  // TODO
+		this.root = doc.querySelector(selector);
+		this.delegatorList = {};
+		this.delegator = (e, ...args) => {
+			let target = e.target;
+			const targetEventList = this.delegatorList[e.type];
+			while( target !== e.currentTarget ) {
+				targetEventList.forEach( item => {
+					if ( target.matches(item.selector) ) {
+						item.func.call( target, e, ...args);
+					}
+				})
+				target = target.parentNode;
+			}
+		}
     }
 
     on (event/* 绑定事件 */, selector/* 触发事件节点对应选择器 */, fn/* 出发函数 */) {
-      // TODO
+		if ( !this.delegatorList[event] ) {
+			this.root.addEventListener(event, this.delegator);
+			this.delegatorList[event] = [];
+		}
+		this.delegatorList[event].push ({ selector: selector, func: fn});
+		return this;
     }
 
     destroy () {
-      // TODO
+		Object.keys( this.delegatorList ).map( event => {
+			this.root.removeEventListener( event, this.delegator);
+		})
+		this.delegatorList = {};
     }
   }