后端获取不到json头请求数据

app.html

@@ -131,26 +131,26 @@
 
             var form = new FormData();
             form = JSON.stringify(params.data);
-            var ContentType = 'application/json';
+            var ContentType = 'application/x-www-form-urlencoded';
+            // var ContentType = 'application/json';
             let header = {
-              // "Content-Type": "application/json",
               "Content-Type": ContentType,
               "Authorization":'Bearer ' + getToken(),
             }
  
             let isFormData = (typeof FormData !== 'undefined') && (params['data'] instanceof FormData);
             
-            if (isFormData) {
-              delete header['Content-Type'];
-              form = data;
-            }
+            // if (isFormData) {
+            //   delete header['Content-Type'];
+            //   form = data;
+            // }
 
             let headers = new Headers(header);
 
             return new Promise(function (resolve, reject) {
                 fetch(url,{
                   method: method,
-                  body: form,
+                  body: params.data,
                   headers: headers
                 }).then(function (response) {
                   return response.json();