Question

我需要遍历一个类似数组的对象，并根据其长度在React Native中渲染组件，并且其中的和是代码：

  const Screen = function({navigation, route}) {
  var data = [];
  var cases = [];
  axios.get(`${uri}cases`)
  .then(json => {
    console.log(json)
    data = json.data
  }).catch(err => {
    console.log(err)
  });

  function showCases(cases){
    cases.forEach(one => {
      cases.push(<Text>one._id</Text>)
    })
  }
showCases(data)
var comp = [<Text>Hello</Text>, <Text>Hello</Text>]
  return(
 <View>
  <View>
  <Button title='Click' onPress={() => {
    cases.push(<Text>Hello</Text>)
    console.log(cases)
    console.log(comp)
    console.log(comp == cases)
    }} />
    <Button
          title="Modern Clinic"
          disabled={true}
        />
        <Button title="Profit" onPress={() => {
          navigation.push('Profit')
        }} />
        <Button title="Expenses" onPress={() => {
          navigation.push('Expenses')
        }}/>
        <Button title="New" onPress={() => {
          navigation.push('New...')
        }}/>
      </View>
    <SafeAreaView>
  <ScrollView>
  <Text>{cases}</Text>
  </ScrollView>
  </SafeAreaView>
</View>
  )
}

我只想遍历data变量和渲染组件我只想要逻辑，因此渲染<Text />组件就可以了，只要逻辑就可以了

Answer 1

您需要使用with open(os.devnull, 'wb') as f: proc = subprocess.Popen(["tar", "-czvf", '/folder/archive.tar.gz', '/folder/some_other_folder'], stdout=f, stderr=subprocess.PIPE) _, stderr = proc.communicate() if proc.returncode != 0: # Assumes from __future__ import print_function at top of file # because Python 2 print statements are terrible print("tar exited with exit status {}:".format(proc.returncode), stderr, file=sys.stderr)，它是React中最常用的组件来显示FlatList，就像List。

在参数数据中传递数据。并将您的组件放在Foreach中。在您的组件中，用renderItem访问foreach的值，在此示例中，数据为： {item.Something}

this.state.listParam = {.{"des":"Name","value":"John","mandatory":true, ...} }

JSX中的循环和渲染

1 个答案: