<center>FlatList警告key问题</center>

按照官网上的说明并不能解决问题:

_keyExtractor = (item, index) => item.id;
render() {
    return (
      <FlatList
        data={this.props.data}
        extraData={this.state}
        keyExtractor={this._keyExtractor}
        renderItem={this._renderItem}
      />
    );
  }

这样写还是会报key的警告

PS:应该像这样写

render() {
    return (
      <FlatList
          showsHorizontalScrollIndicator={false}
           showsVerticalScrollIndicator={false}
           keyExtractor={(item, index) => index.toString()}
           data={this.state.datasource}
           renderItem={this._renderItem}
           enableEmptySections={true} >
      </FlatList>
    );
  }

关键在于.tostring()的运用