forgot this

fun/test/index.html

@@ -70,9 +70,7 @@
                     'Content-type': 'application/json',
                 },
                 body: bd
-            }).then(res => {
-                return res.json();
-            }).then(data => {
+            }).then(res => res.json()).then(data => {
                 if (!data.succeed) {
                     alert(data.msg);
                 }