diff --git a/WeChat/Contracts/Tools.php b/WeChat/Contracts/Tools.php
index 4423894..e78149c 100644
--- a/WeChat/Contracts/Tools.php
+++ b/WeChat/Contracts/Tools.php
@@ -47,24 +47,7 @@ class Tools
         return $str;
     }
 
-    /**
-     * 数据生成签名
-     * @param array $data 签名数组
-     * @param string $method 签名方法
-     * @return bool|string 签名值
-     */
-    public static function getSignature($data, $method = "sha1")
-    {
-        if (!function_exists($method)) {
-            return false;
-        }
-        ksort($data);
-        $params = [];
-        foreach ($data as $key => $value) {
-            $params[] = "{$key}={$value}";
-        }
-        return $method(join('&', $params));
-    }
+
 
     /**
      * 根据文件后缀获取文件MINE
diff --git a/WeChat/Script.php b/WeChat/Script.php
index 4d66aa1..26710a0 100644
--- a/WeChat/Script.php
+++ b/WeChat/Script.php
@@ -85,7 +85,7 @@ class Script extends WeChat
             "appId"     => $appid,
             "nonceStr"  => $data['noncestr'],
             "timestamp" => $data['timestamp'],
-            "signature" => Tools::getSignature($data, 'sha1'),
+            "signature" => $this->getSignature($data, 'sha1'),
             'jsApiList' => [
                 'onWXDeviceBluetoothStateChange', 'onWXDeviceStateChange',
                 'openProductSpecificView', 'addCard', 'chooseCard', 'openCard',
@@ -99,4 +99,23 @@ class Script extends WeChat
             ],
         ];
     }
+
+    /**
+     * 数据生成签名
+     * @param array $data 签名数组
+     * @param string $method 签名方法
+     * @return bool|string 签名值
+     */
+    protected function getSignature($data, $method = "sha1")
+    {
+        if (!function_exists($method)) {
+            return false;
+        }
+        ksort($data);
+        $params = [];
+        foreach ($data as $key => $value) {
+            $params[] = "{$key}={$value}";
+        }
+        return $method(join('&', $params));
+    }
 }
\ No newline at end of file