react native POST数据到服务器或者获取返回数据例程

react native 端参考代码：

import React, { Component } from 'react';
import {
    AppRegistry,
    StyleSheet,
    Text,
    TouchableHighlight,
    Alert,
    TouchableOpacity,
    View
} from 'react-native';


//Post方法, 需要请求体body
/*
* FromData
* 主要用于序列化表单以及创建与表单格式相同的数据
*
* var data = new FormData();
* data.append("name","hello");
* append方法接收两个参数,键和值(key,value),分别表示表单字段的名字 和 字段的值,可添加多个
*
* 在jQuery中,"key1=value1&key2=valu2" 作为参数传入对象框架,会自动分装成FormData形式
* 在Fetch 中,进行post进行post请求,需要自动创建FormData对象传给body
*
* */
function postRequest(url) {
    //将"key1=value1&key2=valu2" 形式封装整FromData形式
    let formData = new FormData();
    formData.append("id","15");
    formData.append("verName","1111aaaa");

    var opts = {
        method:"POST",   //请求方法
        headers: {
            'Accept': 'application/json',
            'Content-Type': 'application/json',
        },
        body:formData,   //请求体
    };


   fetch(url , {
        method: 'POST',
        headers: {
            'Accept': 'application/json',
            'Content-Type': 'application/json',
        },
        body: formData,
    }).then((response) => {
        if (response.ok) {
            return response.json();
        }
    }).then((json) => {
        console.log(json);
        console.log(json.id);
       console.log(json.verName);
        alert(JSON.stringify(json));
    }).catch((error) => {
        console.error(error);
    })
}


export default class HomeScreen extends Component {
    render() {
        return(
            <View style={styles.container}>
                {/*注意: 方法调用方式,绑定了this */}
                <TouchableOpacity onPress={postRequest.bind(this,"http://jmbsjk.com/test/test2.php")}>
                    <View style={styles.btn}>
                        <Text>Post</Text>
                    </View>
                </TouchableOpacity>
            </View>
        );
    }
}

var styles = StyleSheet.create({
    container:{
        flex:1,
        backgroundColor:'cyan',
        marginTop:30,
        flexDirection:'row',
        justifyContent:'center',
        alignItems:'center'
    },
    btn:{
        width:60,
        height:30,
        borderWidth:1,
        borderColor:"yellow",
        justifyContent:'center',
        alignItems:'center'
    }
});

PHP服务器端代码：

<?php

   // $json = file_get_contents("php://input");
   // $data = json_decode($json, true);
    //$id=$data['id'];
    
    $id=$_POST['id'];
    $verName=$_POST['verName'];
    
    //链接数据库
    $con = mysqli_connect("localhost","my_db","123456",'my_db',3306);

    $result = mysqli_query($con,"select * from recordClear where recordId=".$id."");
    $num = mysqli_num_rows($result);
    //printf("总共返回 %d 行数据。",$num);
      // 释放结果集
    //mysqli_free_result($result);
    //获取星期
    $time2 = date("N",time());
    //printf("今天:%s",$time2);
    $sql = "INSERT INTO recordClear(recordId,recordCount,cleardate) VALUES(".$id.",'1',".$time2.")";
    $query = mysqli_query($con,$sql);
    mysqli_close($con);

    $resulttt = array(
    'id'=>$id,
    'verName'=>$verName,            
    );
    echo json_encode($resulttt,128);

?>