chore(Ajax): update ajax body according method (#5881)

* 修复 Ajax 组件 body 内容错误问题 (#5874)

* refactor: 重构代码

* chore: bump version 9.5.11-beta02

---------

Co-Authored-By: AiZhen <aizhen@aizhen.vip>
Co-Authored-By: Argo Zhang <argo@live.ca>

* chore: bump version 9.5.11-beta03

Co-Authored-By: AiZhen <53560110+AiYuZhen@users.noreply.github.com>

---------

Co-authored-by: AiZhen <53560110+AiYuZhen@users.noreply.github.com>
Co-authored-by: AiZhen <aizhen@aizhen.vip>

Author: 3 people

src/BootstrapBlazor/BootstrapBlazor.csproj

@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk.Razor">
 
   <PropertyGroup>
-    <Version>9.5.11-beta01</Version>
+    <Version>9.5.11-beta03</Version>
   </PropertyGroup>
 
   <ItemGroup>

src/BootstrapBlazor/wwwroot/modules/ajax.js

@@ -19,16 +19,24 @@
         if (headers['Content-Type'] === void 0) {
             headers['Content-Type'] = 'application/json; charset=utf-8'
         }
-        const contentType = headers['Content-Type'];
-        let postData = JSON.stringify(data);
-        if (contentType.indexOf('application/x-www-form-urlencoded') > -1) {
-            postData = new URLSearchParams(data).toString();
-        }
-        result = await fetch(url, {
+
+        const fetchOptions = {
             method: method,
-            headers: headers,
-            body: postData
-        });
+            headers: headers
+        }
+
+        if (method === 'PUT' || method === 'POST') {
+            const contentType = headers['Content-Type'];
+            let postData = null;
+            if (data) {
+                postData = JSON.stringify(data);
+                if (contentType.indexOf('application/x-www-form-urlencoded') > -1) {
+                    postData = new URLSearchParams(data).toString();
+                }
+                fetchOptions.body = postData;
+            }
+        }
+        result = await fetch(url, fetchOptions);
         if (toJson === true) {
             result = await result.json()
         }