diff --git a/application/common.php b/application/common.php
index a014f80b..009696e9 100755
--- a/application/common.php
+++ b/application/common.php
@@ -512,3 +512,19 @@ EOT;
         return $icon;
     }
 }
+
+if (!function_exists('download')) {
+    /**
+     * 获取\think\response\Download对象实例
+     * @param string  $filename 要下载的文件
+     * @param string  $name 显示文件名
+     * @param bool    $content 是否为内容
+     * @param integer $expire 有效期（秒）
+     * @param bool    $openinBrowser 设置是否在浏览器中显示文件
+     * @return \think\response\Download
+     */
+    function download($filename, $name = '', $content = false, $expire = 360, $openinBrowser = false)
+    {
+        return (new \app\common\library\response\Download($filename))->name($name)->isContent($content)->expire($expire)->openinBrowser($openinBrowser);
+    }
+}
\ No newline at end of file