diff --git a/index.html b/index.html
index ac9e084..2324b54 100644
--- a/index.html
+++ b/index.html
@@ -248,7 +248,6 @@
                             let doTask = function(){
                                 index = index%list.length;
                                 let item = list[index];
-                                let result = '';
                                 let i = 0;
                                 let hander = setInterval(function(){
                                     if(i<=item.value.length){