新闻客户端04 - 请求网络数据
来源：互联网 发布：恶搞老鼠软件 编辑：程序博客网 时间：2024/06/05 11:21
知识点：
React Native之组件请求网络数据
中文官网
1.Home.js
import React, { Component } from 'react';import { AppRegistry, StyleSheet, Text, View, ListView, Image, TouchableOpacity} from 'react-native';// 导入本地json数据var LocalData = require('../LocalData.json');var Home = React.createClass({ // 不可改变的默认值 getDefaultProps(){ return{ url_api:'http://c.m.163.com/nc/article/headline/T1348647853363/0-20.html', key_word:'T1348647853363' } }, // 初始化 getInitialState(){ return{ // ListView头部轮播图的数据源 headerDataArr:[], // cell的数据源 dataSource: new ListView.DataSource({ rowHasChanged:(r1,r2)=>{r1 !== r2} }) } }, render() { return ( <View style={styles.container}> <Text style={styles.welcome}> 首页 </Text> </View> ); }, // 组件加载完毕之后调用 componentDidMount(){ // 请求网络数据 this.loadDataFromNet(); }, // 请求网络数据的方法 loadDataFromNet(){ fetch(this.props.url_api) .then((response)=>response.json()) .then((responseData)=>{ // 拿到需要的数据 var jsonData = responseData[this.props.key_word]; // 处理数据 this.dealWithData(jsonData); }) .catch((error)=>{ if(error){ // 网络请求失败,就用本地数据 console.log('网络请求失败'); var jsonData = LocalData[this.props.key_word]; this.dealWithData(jsonData); } }) }, // 处理网络数据的细节方法 dealWithData(jsonData){ // 定义临时变量 var headerArr = [], listDataArr = []; // 遍历拿到的json数据 for (var i=0;i<jsonData.length;i++){ // 取出单个对象 var data = jsonData[i]; if(data.hasAD == 1){ // 取出广告数据 headerArr = data.ads; }else { // 非广告数据(行数据) listDataArr.push(data) } } // 更新状态机 this.setState({ // ListView头部轮播图的数据源 headerDataArr:headerArr, // cell的数据源 dataSource:this.state.dataSource.cloneWithRows(listDataArr), }); console.log(headerArr,listDataArr); },});const styles = StyleSheet.create({});// 输出类module.exports = Home;2.分析:
需要在组件加载完毕之后做网络请求。这个案例中为了演示方便，如果网络请求失败，就加载本地的数据
LocalData.json:
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