無法從json響應中轉換Javascript對象的值？

Question

我不知道如何解決它。我得到的價值總是「未定義」，即使我得到的迴應和我通過alert展示這裏是我的ajax代碼和兩張圖片，我從我的結果中收集。一個當我告訴JSON響應和另一個當我告訴json的財產

---

時

alert(json_data). 

---

時

alert(json_data.status) 

，它顯示 「未定義」

Ajax代碼：

$("#input-form").submit(function(e) { 
    var test = checkFile(); 
    var file_data = $('#imgInpbanner').prop('files')[0]; 
    var form_data = new FormData(); 
    if (test == true) { 
     form_data.append('avatar', file_data); 
    } 
    form_data.append('_token', $('#_token').val()); 
    form_data.append('experient_period', $("#experient-period").val()); 
    form_data.append('married', $("#married").val()); 
    form_data.append('acc_id', <?php echo $teacher->acc_id; ?>); 
    form_data.append('official_staff', $("#official_staff").val()); 
    form_data.append('certificate', $("#certificate").val()); 
    form_data.append('birth', $("#birth").val()); 
    form_data.append('beginning_date', $("#beginning-date").val()); 
    form_data.append('gender', $("#gender").val()); 
    form_data.append('user_name', $("#user_name").val()); 
    form_data.append('email', $("#email").val()); 
    form_data.append('password', $("#password").val()); 
    form_data.append('first_name', $("#first_name").val()); 
    form_data.append('last_name', $("#last_name").val()); 
    form_data.append('phone_number', $("#phone_number").val()); 
    form_data.append('address', $("#address").val()); 
    form_data.append('colleague', $("#colleague").val()); 
    var formURL = $(this).attr("action"); 
    $.ajax({ 
     url: formURL, 
     dataType: 'text', // what to expect back from the PHP script, if anything 
     cache: false, 
     contentType: false, 
     processData: false, 
     type: "POST", 
     data: form_data, 
     success: function(data, textStatus, jqXHR) { 
      //data: return data from server 
      var json_data = JSON.parse(JSON.stringify(data)); 
      alert(json_data.status); 
      if (json_data.status == 200) { 
       $('#modal-header').css('background-color', '#00c0ef'); 
       $('#result_inform').text(json_data.message); 
       $('#modaltest').trigger("click"); 
      } else { 
       $('#modal-header').css('background-color', '#d33724'); 
       $('#result_inform').text(json_data.message); 
       $('#modaltest').trigger("click"); 
      } 
     }, 
     error: function(jqXHR, textStatus, errorThrown) { 
      //if fails 
      $('#modal-header').css('background-color', '#d33724'); 
      $('#result_inform').text("Có lỗi xảy ra"); 
      $('#modaltest').trigger("click"); 

     } 
    }); 
    e.preventDefault(); //STOP default action 
    e.unbind(); //unbind. to stop multiple form submit. 
}); 

PHP控制器

$isOldPw = strcmp(Input::get('password'), ''); 
    $acc_id = Input::get('acc_id'); 
    try { 
     $teacher = Teachers::findOrFail($acc_id); 
     $user = Users::findOrFail($acc_id); 
     $isOldEmail = strcmp(Input::get('email'), $user - > email); 
     $isOldUrNm = strcmp(Input::get('user_name'), $user - > user_name); 
     $rules = array(
      'first_name' => 'required|max:10', 
      'last_name' => 'required|max:30', 
      'address' => 'required|max:100', 
      'phone_number' => 'required|max:15|regex:/(0)[0-9]{9}/', 
      'user_name' => 'required|min:5|unique:user', 
      'email' => 'required|email|unique:user', 
      'password' => 'required|min:6' 
     ); 
     if ($isOldPw == 0) array_splice($rules, 6, 1); 
     if ($isOldEmail == 0) array_splice($rules, 5, 1); 
     if ($isOldUrNm == 0) array_splice($rules, 4, 1); 
     $validator = Validator::make(Input::all(), $rules); 
     if ($validator - > fails()) { 
      $messages = $validator - > messages(); 
      return response() - > json(['status' => 400, 'message' => $messages - > toJson()]); 
     } else { 
      $user - > user_name = Input::get('user_name'); 
      $user - > first_name = Input::get('first_name'); 
      $user - > last_name = Input::get('last_name'); 
      $user - > email = Input::get('email'); 
      $user - > address = Input::get('address'); 
      $user - > phone_number = Input::get('phone_number'); 
      if ($isOldPw != 0) 
       $user - > password = Hash::make(Input::get('password')); 
      $user - > gender = (Input::get('gender')); 
      $user - > birth = date('Y-m-d', strtotime(Input::get('birth'))); 
      $teacher - > certificate = (Input::get('certificate')); 
      $teacher - > beginning_time = date('Y-m-d', strtotime(Input::get('beginning_date'))); 
      $teacher - > colleague = (Input::get('colleague')); 
      $teacher - > official_staff = (Input::get('official_staff')); 
      $teacher - > married = (Input::get('married')); 
      $teacher - > experient_period = (Input::get('experient_period')); 

      if (Request::hasFile('avatar') && Input::file('avatar') - > isValid()) { 
       if (strlen($user - > image_url) > strlen(SysConst::get('DEFAULT_AVATAR_PATH'))) 
        File::delete(public_path().$user - > image_url); 
       $img_path = SysConst::get('IMAGE_PATH_USERAVATAR'); 
       $file = Input::file('avatar'); 
       $image_name = time(). 
       '-'.$file - > getClientOriginalName(); 
       $file - > move(public_path().$img_path, $image_name); 
       $image_alter = Image::make(sprintf(public_path().$img_path. 
        '%s', $image_name)) - > resize(128, 128) - > save(); 
       $image_url = $img_path.$image_name; // Note we add the image path to the databse field before the save. 
       $user - > image_url = $image_url; 
      } else { 
       $user - > image_url = SysConst::get('DEFAULT_AVATAR_PATH'); 
      } 
      DB::beginTransaction(); 
      $user - > save(); 
      $teacher - > acc_id = $user - > id; 
      $teacher - > save(); 
      DB::commit(); 
      return response() - > json(['status' => 200, 'message' => 'Cập nhật thành công']); 
     } 
    } catch (\PDOException $ex) { 
     DB::rollBack(); 
     return response() - > json([ 
      "status" => 500, 
      "message" => $ex - > getMessage() 
     ]); 
    } catch (\Exception $ex) { 
     return response() - > json(['status' => 400, 'message' => $ex - > getMessage()]); 
    } 

Answer 1

你不需要JSON.stringify(data)爲您的數據已經在json string你只需要parse它。

更改此

var json_data = JSON.parse(JSON.stringify(data)); 

要

var json_data = JSON.parse(data);