如何将以下PHP Curl请求转换为Javascript POST？

    $ch = curl_init();
    curl_setopt($ch,CURLOPT_URL,"https://accounts.google.com/o/oauth2/token");
    curl_setopt($ch,CURLOPT_POST,TRUE);
    curl_setopt($ch,CURLOPT_HTTPHEADER,[ 'Content-Type: application/x-www-form-urlencoded']);
    curl_setopt($ch,CURLOPT_POSTFIELDS,http_build_query([
        'code'          => $code,'client_id'     => $client_id,'client_secret' => $client_secret,'redirect_uri'  => $redirect_uri,'grant_type'    => 'authorization_code',]));
    curl_setopt($ch,CURLOPT_RETURNTRANSFER,true);
    $response = curl_exec($ch);
    curl_close ($ch);

我尝试了以下类似方法。但是收到400错误的请求错误。如何在此处设置 CURLOPT_RETURNTRANSFER 。还是我做错了什么？

         $.ajax({
               type: 'POST',url: "https://accounts.google.com/o/oauth2/token",contentType: 'application/x-www-form-urlencoded',dataType: 'json',data: {
                    client_id: client_id,client_secret: client_secret,code: code,redirect_uri: redirect_uri,grant_type: grant_type,},success: function (data) {
                    $('#response').html(data);
                },error: function (e) {
                    $('#response').html(e.responseText);
                }             
        });