如何将POST（javascript）发送到laravel刀片文件？

I made a webcam page in Laravel5.
I would like to send POST(javascript, WEBCAMjs) to crop.blade.php(laravel).

My code works well when run with only php.
   => form.setAttribute("action", "crop.php"); However, if I try to send it to laravel(crop.blade.php), it returns MethodNotAllowedHttpException.
   => form.setAttribute("action", "crop.blade.php");

How can I solve this problem?
thanks for your help in advance!

Webcam.snap( function(data_uri) {
        var obj1 = data_uri
        var form = document.createElement("form");
        form.setAttribute("charset", "UTF-8");
        form.setAttribute("method", "Post");
        #form.setAttribute("action", "crop.php");
        form.setAttribute("action", "crop.blade.php");
        var hiddenField = document.createElement("input");
        hiddenField.setAttribute("type", "hidden");
        hiddenField.setAttribute("name", "raw");
        hiddenField.setAttribute("value", obj1);
        form.appendChild(hiddenField);

        var url ="crop"

        var status = "toolbar=no,directories=no,scrollbars=no,resizable=no,status=no,menubar=no,width=1240, height=1200, top=0,left=20"

        document.body.appendChild(form);
        form.submit();
}

It will be the routing. If you go to your web.php file, you will see the route that you are loading for the page. It might look like the following:

Route::get('crop', function () {
    return view('crop');
});

You also need the following to allow post requests

Route::post('crop', function () {
    // Logic for the post request
});

Obviously it would be better to use controllers instead of closures, but that's the general idea.