refactor: 优化后台兼容接口请求的判断

extend/base/admin/controller/system/AdminBase.php

@@ -44,7 +44,7 @@ class AdminBase extends AdminController
      */
     public function index()
     {
-        if ($this->request->isJson()) {
+        if ($this->request->isAjax()) {
             if (input('selectFields')) {
                 return $this->selectList();
             }

extend/base/common/controller/AdminControllerBase.php

@@ -222,7 +222,7 @@ class AdminControllerBase extends BaseController
     public function checkParseApi()
     {
         if (Config::get('app.auto_parse_api')) {
-            if ($this->request->isJsonPure() && $this->request->param('get_page_data')) {
+            if ($this->request->isJson() && $this->request->param('get_page_data')) {
                 return true;
             }
         }

extend/base/common/provider/RequestBase.php

@@ -10,35 +10,34 @@ class RequestBase extends \think\Request
     protected $filter = [];
 
     /**
-     * 当前是否JSON请求
+     * 当前是否Ajax请求
+     * @access public
+     * @param  bool $ajax true 获取原始ajax请求
      * @return bool
      */
-    public function isJson(): bool
+    public function isAjax(bool $ajax = false): bool
     {
-        $acceptType = $this->type();
+        $value  = $this->server('HTTP_X_REQUESTED_WITH');
+        $result = $value && 'xmlhttprequest' == strtolower($value) ? true : false;
 
-        $is_json = str_contains($acceptType, 'json');
-        if (!$is_json) {
-            return false;
+        if (true === $ajax) {
+            return $result;
         }
 
+        $is_ajax = $this->param($this->varAjax) ? true : $result;
+
         if (!Config::get('app.auto_parse_api')) {
+            return $is_ajax;
+        }
+
+        if($this->isJson()){
+            if ($this->has('get_page_data')) {
+                return false;
+            }
             return true;
         }
-        if ($this->has('get_page_data')) {
-            return false;
-        }
 
-        return true;
+        return $is_ajax;
     }
 
-    /**
-     * 仅通过实际请求参数判断请求
-     *
-     * @return bool
-     */
-    public function isJsonPure()
-    {
-        return parent::isJson();
-    }
 }