我用的faltlist做的显示列表，后台传的是个list集合在前台让它显示。总是报要有唯一的key？

Question

这是问题：Warning: Each child in an array or iterator should have a unique "key" prop.

这是代码：requestData = () => {
   fetch(url).then(res => {
       console.log('started fetch');
return res.json()
   }).then(res => {
       console.log(res.list);
let dataBlob=res.list;
this.setState({
           //data: [...this.state.data, ...res],
           data: dataBlob,
           error: res.error || null,
           laoding: false,
           refreshing: false,
       });
   }).catch(err => {
       console.log('==> fetch error', err);
this.setState({ error: err, loading: false, refreshing: false});
   });
};

renderItem = (item) => {
var txt = '下标为：'+item.index+'姓名'+item.item.userName;
var bgColor = item.index % 2 == 0 ? 'red' : 'blue';
return <Text style={[{flex:1,height:200,backgroundColor:bgColor},styles.txt]}>{txt}</Text>
}

跪求！！！

Answer 1

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