JSON.parse：JSON数据第1行第1列的意外数据结尾（Angular2后端php服务器SQL）

问题描述：

I am getting this(JSON.parse: unexpected end of data at line 1 column 1 of the JSON data )error in my Response from the server. I did console.log for JSON.stringify(user) and it shows the object as it should be.Even the data is been stored to database. this is my service.ts

signup(user: User) {

    const body = JSON.stringify(user);

    const headers = new Headers({'Content-Type': 'application/json'});
    const requestOptions = new RequestOptions({method : RequestMethod.Post,headers : headers});
    return this.http.post('url', body,requestOptions)
        .map((response: Response) => response.json())


}

signin(user: User) {
    const body = JSON.stringify(user);
    const headers = new Headers({'Content-Type': 'application/json'});
    return this.http.post('url', body, {headers: headers})
        .map((response: Response) => response.json())

}

logout() {
    localStorage.clear();
}

isLoggedIn() {
    return localStorage.getItem('token') !== null;
}

this is my php file

<?php
include "db.php";
header("Access-Control-Allow-Origin: *");
header("Content-Type: application/json; charset=UTF-8");
$data = json_decode(file_get_contents("php://input"));
//print_r($data);
/*$firstname = mysql_real_escape_string($data->firstName);
$lastname = mysql_real_escape_string($data->lastName);
$email = mysql_real_escape_string($data->email);
$password = mysql_real_escape_string($data->password);*/

$sql = "INSERT INTO `tbl_user`(`firstname`, `lastname`, `email`,  `password`) VALUES                       ('$data->firstName','$data->lastName','$data->email','$data->password')";
if($data->firstName){
$qry = $conn->query($sql);
}

$conn->close();
?>

我得到了这个（JSON.parse：JSON数据的第1行第1行意外的数据结束）错误在我的服务器响应中。我为JSON.stringify（用户）做了console.log，它显示了应该的对象。即使数据已存储到数据库。这是我的service.ts p>

  signup（user：User）{
 
 const body = JSON.stringify（user）; 
 
 const headers = new Headers（{'Content-Type'：'application / json'}）; 
  const requestOptions = new RequestOptions（{method：RequestMethod.Post，headers：headers}）; 
返回this.http.post（'url'，body，requestOptions）
 .map（（response：Response）=＆gt; response  .json（））
 
 
} 
 
signin（用户：用户）{
 const body = JSON.stringify（user）; 
 const headers = new Headers（{'Content-Type'：'  application / json'}）; 
返回this.http.post（'url'，body，{headers：headers}）
 .map（（response：Response）=＆gt; response.json（））
 \  n} 
 
logout（）{
 localStorage.clear（）; 
} 
 
 
NisLoggedIn（）{
返回localStorage.getItem（'token'）！== null; 
} 
   code>  pre> 
 
 这是我的php文件 p> 
 
 
 ＆lt;？php 
include“db.php”; 
header（“Access-  C  ontrol-Allow-Origin：*“）; 
header（”Content-Type：application / json;  charset = UTF-8“）; 
 $ data = json_decode（file_get_contents（”php：// input“））; 
 // print_r（$ data）; 
 / * $ firstname = mysql_real_escape_string（$ data-＆gt  ; firstName）; 
 $ lastname = mysql_real_escape_string（$ data-＆gt; lastName）; 
 $ email = mysql_real_escape_string（$ data-＆gt; email）; 
 $ password = mysql_real_escape_string（$ data-＆gt; password）; *  / 
 
 $ sql =“INSERT INTO`tbl_user`（`firstname`，`lastname`，`email`，`password`）VALUES（'$ data-＆gt; firstName'，'$ data-＆gt; lastName'  ，'$ data-＆gt; email'，'$ data-＆gt; password'）“; 
if（$ data-＆gt; firstName）{
 $ qry = $ conn-＆gt; query（$ sql）; 
  } 
 
 $ conn-＆gt; close（）; 
？＆gt; 
  code>  pre> 
  div>

答

heres the updated php file

<?php
include "db.php";
header("Access-Control-Allow-Origin: *");
header("Content-Type: application/json; charset=UTF-8");
$data = json_decode(file_get_contents("php://input"));

$firstname = $mysqli->real_escape_string($data->firstName);
$lastname = $mysqli->real_escape_string($data->lastName);
$email = $mysqli->real_escape_string($data->email);
$password = $mysqli->real_escape_string($data->password);
$sql = "INSERT INTO `tbl_user`(`firstname`, `lastname`, `email`, `password`) VALUES ('$data->firstName','$data->lastName','$data->email','$data->password')";
if (mysqli_query($mysqli,$sql))
 {
 $arr = array('sucess' => "Records save");
 $jsn = json_encode($arr);
 print_r($jsn);
 }
 else 
 {
 $arr = array('failed' => "No records save", 'error' => '');
 $jsn = json_encode($arr);
 print_r($jsn);
 }

 ?>

JSON.parse：JSON数据第1行第1列的意外数据结尾（Angular2后端php服务器SQL）

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