Merge pull request #1 from zhaishuaigan/master

修复验证码不显示问题

README.md

@@ -2,7 +2,7 @@
 thinkphp5 验证码类库
 
 ## 安装
-> composer install topthink/think-captcha
+> composer require topthink/think-captcha
 
 
 ##使用

src/CaptchaController.php

@@ -12,9 +12,8 @@
 namespace think\captcha;
 
 use think\Config;
-use think\Controller;
 
-class CaptchaController extends Controller
+class CaptchaController
 {
     public function index($id = "")
     {

src/helper.php

@@ -24,7 +24,7 @@
  */
 function captcha($id = "", $config = [])
 {
-    $captcha = new \think\Captcha($config);
+    $captcha = new \think\captcha\Captcha($config);
     $captcha->entry($id);
 }
 
@@ -35,7 +35,7 @@ function captcha($id = "", $config = [])
  */
 function captcha_src($id = "")
 {
-    return \think\Url::build('/captcha' . $id ? "/{$id}" : '');
+    return \think\Url::build('/captcha' . ($id ? "/{$id}" : ''));
 }