修复点播bug

src/DataStore.js

@@ -397,7 +397,7 @@ class DataPageStore {
 
   findInPlayList(hash) {
     let tempList = this.playSongList;
-    tempList.findIndex((item, index, arr) => {
+    return tempList.findIndex((item, index, arr) => {
       return hash === item.Hash;
     })
   }