chengkdixin

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![image](https://user-images.githubusercontent.com/37794324/109473069-d36d0400-7aad-11eb-9627-d73229771a3c.png)

下拉刷新加载完成之后只能再用一次，用第二次的时候就会报错

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![image](https://user-images.githubusercontent.com/37794324/63493133-80e07e00-c4ed-11e9-8435-6ae415acf612.png) ![image](https://user-images.githubusercontent.com/37794324/63493190-a1103d00-c4ed-11e9-87e1-69d86ba2c5d8.png)