update yooasset2.0

Assets/YooAsset/Runtime/CacheSystem/PersistentHelper.cs

@@ -0,0 +1,24 @@
+
+namespace YooAsset
+{
+	internal static class PersistentHelper
+	{
+		/// <summary>
+		/// 获取WWW加载本地资源的路径
+		/// </summary>
+		public static string ConvertToWWWPath(string path)
+		{
+#if UNITY_EDITOR
+			return StringUtility.Format("file:///{0}", path);
+#elif UNITY_IPHONE
+			return StringUtility.Format("file://{0}", path);
+#elif UNITY_ANDROID
+			return path;
+#elif UNITY_STANDALONE
+			return StringUtility.Format("file:///{0}", path);
+#elif UNITY_WEBGL
+			return path;
+#endif
+		}
+	}
+}