假设第四次获得扫描结果

TC1/http_server/app_httpd.c

@@ -148,8 +148,10 @@ exit:
 
 static int http_get_wifi_scan(httpd_request_t *req)
 {
+    static int n = 1;
     OSStatus err = kNoErr;
-    send_http("OK", 2, exit, &err);
+    char* re = (n++)%4 == 0 ? "OK" : "NO";
+    send_http(re, 2, exit, &err);
 exit:
     return err;
 }

TC1/http_server/index.html

@@ -319,26 +319,26 @@ function SubmitNetwork() {
     }
 }
 
-var get_ret = false;
 function Rescan() {
     HttpPost("/wifi/scan", function (re) {
-        alert(re);
         if (re == "OK") {
-            get_ret = true;
+            rescan_btn.innerHTML = "Scanning...";
+            rescan_btn.disabled = true;
             window.setTimeout(GetScanResult, 1000);
+        } else {
+            alert(re);
         }
     });
 }
 
-var tt = 5;
 function GetScanResult() {
     HttpGet("/wifi/scan", function (re) {
-        console.log(re);
+        if (re == "OK") {
-        if (get_ret && tt <= 0) {
+            rescan_btn.innerHTML = "Rescan";
-            get_ret = 0
+            rescan_btn.disabled = false;
+            return;
         }
         window.setTimeout(GetScanResult, 1000);
-        tt--;
     });
 }