wxnsmile

Results 2 issues of wxnsmile

运行webpack之后，没有报错但是没有反应，

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![image](https://cloud.githubusercontent.com/assets/8544948/19716750/ff6271fa-9b8f-11e6-9a57-c5ca89407109.png) bundle.js没有找到

change itemHeight, selected item can't show center

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![image](https://user-images.githubusercontent.com/8544948/65755648-1c48bc80-e146-11e9-8bb7-d6f80c6ed03f.png)