将ajax数据发送到路由以调用控制器方法

我试图通过参数将ajax数据传递给“settings/addsection/{class_id}”路由，以便调用一个控制器方法来登录laravel日志文件。但是日志记录不起作用。因此ajax没有向路由发送数据。我该怎么解决这个问题？。。请注意，我传递给隐藏输入的$class_id在我从数据库查询时具有值

JAVASCRIPT

<script>

    document.addEventListener('DOMContentLoaded' , function(){

       var add =  document.getElementById('addSection');
       add.addEventListener('submit' , function(e){
            e.preventDefault();
            var class_id = document.getElementById('class_id').value;
            var section = document.getElementById('name').value;
            var token = document.getElementsByName('_token')[0].value;

            var data = {
                name:section,
                _token:token
            }

            var xhr = new XMLHttpRequest();
            xhr.open('POST', 'settings/addsection/' + class_id, true);
            xhr.setRequestHeader('Content-Type' , 'application/json');
            xhr.send(JSON.stringify(data));

       })
    })

</script>

SectionController

<?php

namespace App\Http\Controllers;

use Illuminate\Http\Request;
use Illuminate\Support\Facades\Log;
use App\Section;

class SectionController extends Controller
{
    public function store(Request $request , $class_id){
        //do stuff here
        Log::info(' it works');
    }
}

---

我通过更改此

xhr.open（'POST'，'settings/addsection/'+class_id，true）

到

xhr.open（'POST'，“{url（'settings/addsection/'）}”+'/'+class_id，true）

Route::middleware(['auth' , 'admin'])->group(function(){
    Route::prefix('settings')->group(function(){
        Route::post('addsection/{class_id}' , 'SectionController@store');
    });

});

<?php

namespace App\Http\Controllers;

use Illuminate\Http\Request;
use Illuminate\Support\Facades\Log;
use App\Section;

class SectionController extends Controller
{
    public function store(Request $request , $class_id){
        //do stuff here
        Log::info(' it works');
    }
}