React Native-意外的标识符

React Native - unexpected identifier

本文关键字：标识符 意外 Native- React      更新时间：2023-09-26

我在以下程序的fetchMovies() {行上收到一个意外的标识符错误：

/**
 * Sample React Native App
 * https://github.com/facebook/react-native
 */
'use strict';
var React = require('react-native'),
{
  StyleSheet,
  Component,
  AppRegistry,
  ListView,
  View,
  Text,
  Image
} = React,
baseUrl = 'http://api.rottentomatoes.com/api/public/v1.0/lists/movies/in_theaters.json',
apiKey = '7waqfqbprs7pajbz28mqf6vz',
pageLimit = 25,
queryString = '?apikey=' + apiKey + '&page_limit=' + pageLimit,
url = baseUrl + queryString,
styles = StyleSheet.create({
  container: {
    flex: 1,
    flexDirection: 'row',
    justifyContent: 'center',
    alignItems: 'center',
    backgroundColor: 'white',
  },
  rightContainer: {
    flex: 1,
  },
  title: {
    marginBottom: 8,
    textAlign: 'center'
  },
  year: {
    fontSize: 10,
    textAlign: 'center'
  },
  thumbnail: {
    width: 53,
    height: 81
  },
  listView: {
    paddingTop: 20,
    backgroundColor: 'black'
  }
})
class movieList extends Component{
  getInitialState() {
    return {
      dataSource: new ListView.DataSource({
        rowHasChanged: (row1, row2) => row1 !== row2
      }),
      loaded: false
    }
  },
  fetchMovies() {
    return fetch(url)
    .then((response) => response.json())
    .then((data) => data.movies)
  },
  componentDidMount() {
    this.fetchMovies()
    .then((movies) => {
      this.setState({
        dataSource: this.state.dataSource.cloneWithRows(movies),
        loaded: true
      })
    })
    .done()
  },
  getLoadingView() {
    return (
      <View style={styles.container}>
        <Text>
          Loading Movies...
        </Text>
      </View>
    )
  },
  renderMovie(movie) {
    if (!this.state.loaded) {
      return this.getLoadingView()
    }
    return (
      <View style={styles.container}>
        <Image
          source={{uri: movie.posters.thumbnail}}
          style={styles.thumbnail}
        />
        <View style={styles.rightContainer}>
          <Text style={styles.title}>{movie.title}</Text>
          <Text style={styles.year}>{movie.year}</Text>
        </View>
      </View>
    )
  },
  render() {
    return (
      <ListView
        dataSource={this.state.dataSource}
        renderRow={this.renderMovie}
        style={styles.listView}
      />
    )
  }
}
AppRegistry.registerComponent('movieList', () => movieList)

我做错了什么？

您将class构造视为一系列逗号分隔的类似var的函数表达式，但class不是这样工作的。类中的方法定义更像函数声明，并且不在它们后面加逗号，因为它们不像var之后的变量列表那样是一个大表达式的一部分。

class movieList extends Component{
  getInitialState() {
    return {
      dataSource: new ListView.DataSource({
        rowHasChanged: (row1, row2) => row1 !== row2
      }),
      loaded: false
    }
  } // <=== No comma here
  fetchMovies() {
    // ...
  }
  // ...
}
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