hot word icon-review by huangtao

@@ -50,15 +50,17 @@ edit.prototype = {
     },
     off: function(name, callback) {
         var __self = this;
-        var _e = __self.registerEvent[name];
+        var _e = __self.registerEvent[name] || [];
         var e = [];
-        me.each(_e, function(name, _callback) {
+
+        _e.forEach(function(_callback, index) {
             if (_callback === callback) {
-                e.push(name);
+                e.push(index);
             }
         });
-        me.each(e.reverse(), function(name, _callback) {
-            _e.splice(_callback, 1);
+
+        e.reverse().forEach(function(index) {
+            _e.splice(index, 1);
         });
     },
     init: function() {