反应本机，限制外部文档的JSON输出

Question

我正在尝试将JSON内容输出到一个套件列表中，如React Native Docs中所述。将内容输出到页面不是问题，我正在面对，我正在尝试限制每个JSON字段输出的数据量。

例如，有4个州，身体，精神，情感和精神。我正在尝试仅输出第一个元素，因此在这种情况下，或[0]。

我有以下代码，该代码将输出所有4个值，并且我在将值限制为仅第一个元素时遇到困难：

<FlatList
data={this.state.dimensionJson}
renderItem={({item}) => <Text style={[styles.dimensionTitle, { color: progress[3] }]}>{item.type}</Text>}
keyExtractor={({id}, index) => id}
/> 

检索JSON数据的代码如下：

componentDidMount(){
return fetch(url,{
  method: 'GET',
  headers: {
    Accept: 'applications/json',
  },
},
)
.then((response) => response.json())
.then((responseJson) => {
  this.setState({
    isLoading: false,
    titleData: responseJson.title,
    fullJSON: responseJson,
    dimensionJson: responseJson.dimensions,
  }, function() {

    //Potentially write if function in here for limiting output
  });
})
.catch((error) =>{
  console.error(error)
})}

最后我的JSON看起来像这样：

{
  "description": "Begin by identifying  the dimension of energy you would like to address. Your scores can guide the way.",
  "title": "Choose a Dimension",
  "dimensions": [
    {
      "id": "0",
      "type": "Physical",
      "desc": "Physical energy is the quantity of  energy. This dimension shapes our sustainability and long-term productivity."
     },
    {
      "id": "1",
      "type": "Mental",
       "desc": "Mental energy is the focus of our energy. It influences our 
concentration, control of attention, and the likelihood of making mistakes."
    },
    {
      "id": "2",
      "type": "Emotional",
      "desc": "Emotional energy is the quality of our energy. It affects how 
resilient we are, especially when faced with complexity."
    },
    {
      "id": "3",
      "type": "Spiritual",
      "desc": "Spiritual energy is the energy we derive from serving a  
greater purpose. It inspires us and answers the question ‘Why do I get out 
of bed each morning?"
    }
  ]
 }

Answer 1

尝试切片数据

 <FlatList
                        data={this.state.dimensionJson.slice(0,1)}
                        renderItem={({item}) => <Text style={[styles.dimensionTitle, { color: progress[3] }]}>{item.type}</Text>}
                        keyExtractor={({id}, index) => id}
                        />