doc error

xwenliang · xwenliang · commit 29f599e13dd8 · 2016-09-23T11:04:46.000+08:00
diff --git a/README.md b/README.md
@@ -92,7 +92,7 @@
 
 ```javascript
 	pickerData = [1,2,3,4];
-	selectedValue = 3;
+	selectedValue = [3];
 ```
 
 - two or more wheel:
