diff --git a/app/src/main/assets/print_demo.html b/app/src/main/assets/print_demo.html
index f00941b..69d5f54 100644
--- a/app/src/main/assets/print_demo.html
+++ b/app/src/main/assets/print_demo.html
@@ -264,9 +264,9 @@
     document.getElementById('current-time').innerText = new Date().toLocaleString();
 
     function checkApp() {
-        const tag = document.getElementById('inject-status');
-        const versionSpan = document.getElementById('app-version');
-        const envSpan = document.getElementById('env-type');
+        var tag = document.getElementById('inject-status');
+        var versionSpan = document.getElementById('app-version');
+        var envSpan = document.getElementById('env-type');
 
         if (window.android) {
             tag.innerText = "已连接至 App 原生接口";
@@ -539,29 +539,33 @@
         container.insertBefore(item, container.firstChild);
     }
 
-    async function pttRequest(path, method = 'GET', query = {}, body = null) {
-        let url = PTT_BASE + path;
-        const qParams = new URLSearchParams(query).toString();
+    function pttRequest(path, method, query, body) {
+        if (!method) method = 'GET';
+        if (!query) query = {};
+        var url = PTT_BASE + path;
+        var qParams = new URLSearchParams(query).toString();
         if (qParams) url += "?" + qParams;
 
-        const options = {
+        var options = {
             method: method,
             headers: { 'Content-Type': 'application/json' }
         };
         if (body) options.body = JSON.stringify(body);
 
         try {
-            const response = await fetch(url, options);
-            if (path === '/record/play') {
-                showPttResult("流式播放接口已调用，请查看网络请求或直接点击预览链接");
-                return;
-            }
-            const data = await response.json();
-            showPttResult(data);
-            return data;
+            fetch(url, options).then(function(response) {
+                if (path === '/record/play') {
+                    showPttResult("流式播放接口已调用");
+                    return;
+                }
+                return response.json();
+            }).then(function(data) {
+                if (data) showPttResult(data);
+            }).catch(function(e) {
+                showPttResult("请求失败: " + e.message);
+            });
         } catch (e) {
-            showPttResult("请求失败: " + e.message);
-            console.error(e);
+            showPttResult("fetch异常: " + e.message);
         }
     }