1. 修复滑块验证码，存在失败的情况

2. 重新构建 demo 预览项目

yudao-module-system/yudao-module-system-biz/src/main/java/cn/iocoder/yudao/module/system/controller/admin/captcha/CaptchaController.java

@@ -0,0 +1,42 @@
+package cn.iocoder.yudao.module.system.controller.admin.captcha;
+
+import com.anji.captcha.model.common.ResponseModel;
+import com.anji.captcha.model.vo.CaptchaVO;
+import io.swagger.annotations.Api;
+import io.swagger.annotations.ApiOperation;
+import org.springframework.web.bind.annotation.PostMapping;
+import org.springframework.web.bind.annotation.RequestBody;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RestController;
+
+import javax.annotation.security.PermitAll;
+import javax.servlet.http.HttpServletRequest;
+
+/**
+ * 验证码
+ *
+ * 问题：为什么不直接使用 anji 提供的 CaptchaController，而要另外继承？
+ * 回答：管理使用 /admin-api/* 作为前缀，所以需要继承！
+ *
+ * @author 芋道源码
+ */
+@Api(tags = "管理后台 - 验证码")
+@RestController("adminCaptchaController")
+@RequestMapping("/captcha")
+public class CaptchaController extends com.anji.captcha.controller.CaptchaController {
+
+    @PostMapping({"/get"})
+    @ApiOperation("获得验证码")
+    @PermitAll
+    public ResponseModel get(@RequestBody CaptchaVO data, HttpServletRequest request) {
+        return super.get(data, request);
+    }
+
+    @PostMapping({"/check"})
+    @ApiOperation("校验验证码")
+    @PermitAll
+    public ResponseModel check(@RequestBody CaptchaVO data, HttpServletRequest request) {
+        return super.check(data, request);
+    }
+
+}