diff --git a/library/think/Loader.php b/library/think/Loader.php
index b4213bca..841c37d9 100644
--- a/library/think/Loader.php
+++ b/library/think/Loader.php
@@ -23,7 +23,7 @@ class Loader
     /**
      * @var array 类名映射
      */
-    protected static $map = [];
+    protected static $classMap = [];
 
     /**
      * @var array 命名空间别名
@@ -99,8 +99,8 @@ class Loader
     private static function findFile($class)
     {
         // 类库映射
-        if (!empty(self::$map[$class])) {
-            return self::$map[$class];
+        if (!empty(self::$classMap[$class])) {
+            return self::$classMap[$class];
         }
 
         // 查找 PSR-4
@@ -156,7 +156,7 @@ class Loader
         }
 
         // 找不到则设置映射为 false 并返回
-        return self::$map[$class] = false;
+        return self::$classMap[$class] = false;
     }
 
     /**
@@ -169,9 +169,9 @@ class Loader
     public static function addClassMap($class, $map = '')
     {
         if (is_array($class)) {
-            self::$map = array_merge(self::$map, $class);
+            self::$classMap = array_merge(self::$classMap, $class);
         } else {
-            self::$map[$class] = $map;
+            self::$classMap[$class] = $map;
         }
     }
 
@@ -292,12 +292,12 @@ class Loader
                 $declaredClass = get_declared_classes();
                 $composerClass = array_pop($declaredClass);
 
-                self::$prefixLengthsPsr4 = $composerClass::$prefixLengthsPsr4;
+                foreach (['prefixLengthsPsr4', 'prefixDirsPsr4', 'fallbackDirsPsr4', 'prefixesPsr0', 'fallbackDirsPsr0', 'classMap'] as $attr) {
+                    if (property_exists($composerClass, $attr)) {
+                        self::${$attr} = $composerClass::${$attr};
+                    }
+                }
 
-                self::$prefixDirsPsr4 = property_exists($composerClass, 'prefixDirsPsr4') ? $composerClass::$prefixDirsPsr4 : [];
-
-                self::$prefixesPsr0 = property_exists($composerClass, 'prefixesPsr0') ? $composerClass::$prefixesPsr0 : [];
-                self::$map          = property_exists($composerClass, 'classMap') ? $composerClass::$classMap : [];
             } else {
                 self::registerComposerLoader();
             }