Merge pull request #418 from Stumble/yumin/fix-first-time-switch

First time quality switch to default quality should not fired.

src/js/player.js

@@ -495,6 +495,7 @@ class DPlayer {
     }
 
     switchQuality (index) {
+        index = typeof index === 'string' ? parseInt(index) : index;
         if (this.qualityIndex === index || this.switchingQuality) {
             return;
         }