缓存驱动类调整

library/think/cache/driver/File.php

@@ -11,6 +11,8 @@
 
 namespace think\cache\driver;
 
+use think\Cache;
+
 /**
  * 文件类型缓存类
  * @author    liu21st <liu21st@gmail.com>
@@ -96,7 +98,7 @@ class File
         if (!is_file($filename)) {
             return false;
         }
-        \think\Cache::$readTimes++;
+        Cache::$readTimes++;
         $content = file_get_contents($filename);
         if (false !== $content) {
             $expire = (int) substr($content, 8, 12);
@@ -127,7 +129,7 @@ class File
      */
     public function set($name, $value, $expire = null)
     {
-        \think\Cache::$writeTimes++;
+        Cache::$writeTimes++;
         if (is_null($expire)) {
             $expire = $this->options['expire'];
         }