ajax Кнопки

<meta name="csrf-token" content="{{ csrf_token() }}">
//В main.js
    $('.sendItAjax').on('click', function (e) {
        e.preventDefault();
        var $this = $(this),
            data = {},
        tmp = $this.data('data').split(',');
        tmp.forEach(function (item) {
            data[item] = $('#'+item).val() || $this.data(item) || null;
        });
        $.ajax({
            headers: {
                'X-CSRF-Token': $('meta[name="csrf-token').attr('content')
            },
            url: $this.prop('href') || $this.data('href'),
            method: $this.data('method') || 'GET',
            data: data,
            success: function (data, status, settings) {
                let func = window[$this.data('func')];
                if (typeof func === "function") {
                    func(data, status, settings);
                }
            },
            error: function (err) {
                alert('Ошибка, повторите позже!');
            }
        }).then(function (data) {
            let func = window[$this.data('then')];
            if (typeof func === "function") {
                func(data);
            }
        })
    });

// Применение на странице
<input id="user" value="" />
<input id="password" value="" />

<a class="sendItAjax btn btn-success" href="/" data-func="funcSuccessIt" >GO</a>

<button class="sendItAjax btn btn-success" data-href="/" data-func="funcSuccessIt" data-method="post" data-data="user,password">
<i class="fas star"></i>
</button>

<script>
funcSuccessIt = function(data){
$this.find('i.star').toggleClass('fas').toggleClass('far');
alert(data);
</script>