update

simple-demo/js/util.js

@@ -54,11 +54,17 @@ function my_tip(string) {
     }, 2000)
 }
 
-// 发送同步请求 let a = sendSyncRequest("https://httpbin.tianyunperfect.cn/ip","GET",1)
-function sendSyncRequest(url, method, data) {
+// 发送同步请求 let a = sendSyncRequest("https://httpbin.tianyunperfect.cn/ip","GET",null,null)
+function sendSyncRequest(url, method, data, headers) {
     const xhr = new XMLHttpRequest();
     xhr.open(method, url, false);
 
+    if (headers) {
+        for (const key in headers) {
+            xhr.setRequestHeader(key, headers[key]);
+        }
+    }
+
     if (method.match(/^(POST|PUT)$/i)) {
         xhr.setRequestHeader('Content-Type', 'application/json');
         xhr.send(JSON.stringify(data));