finish

karma.conf.js

@@ -62,7 +62,7 @@ module.exports = function(config) {
 
     // Continuous Integration mode
     // if true, Karma captures browsers, runs the tests and exits
-    singleRun: false,
+    singleRun: true,
 
     // Concurrency level
     // how many browser should be started simultaneous

lib/index.js

@@ -3,14 +3,44 @@
   class Delegator {
     constructor (selector/* root选择器 */) {
       // TODO
+      this.root = doc.querySelector(selector);
+      this.eventsObj = {};
+      this.delegator = e =>{
+        let target = e.target;
+        let currentTarget = e.currentTarget;
+        while(target !== currentTarget){
+            this.eventsObj[e.type].forEach(item => {
+            if(target.matches(item.selector)){
+                item.callback.call(target,e);
+            }
+          });
+
+          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.eventsObj[event]){
+        this.eventsObj[event] = [];
+      }
+      this.eventsObj[event].push({
+          selector,
+          callback: fn
+      })
+
+      this.root.addEventListener(event, this.delegator);
+      return this;
     }
 
     destroy () {
       // TODO
+      Object.keys(this.eventsObj).forEach(item => {
+        this.root.removeEventListener(item, this.delegator)
+      })
+      this.eventsObj = {};
     }
   }