classlist.toggle()在移动safari上不能正常工作

if (navigator.userAgent.match(/Version\/(\d+)\.(\d+)(?:\.(\d+))?.*Safari/)) {
    var majorVersion = parseInt(RegExp.$1, 10);
    if (majorVersion < 14) {
        alert('请升级您的 Safari 浏览器以获得更好的体验。');
    }
}

if (!('classList' in document.documentElement)) {
    Object.defineProperty(Element.prototype, 'classList', {
        get: function() {
            var self = this;
            function update(fn) {
                return function(value) {
                    var classes = self.className.split(/\s+/g),
                        index = classes.indexOf(value);

                    fn(classes, index, value);
                    self.className = classes.join(' ');
                };
            }

            return {
                add: update(function(classes, index, value) {
                    if (!~index) classes.push(value);
                }),

                contains: function(value) {
                    return !!~self.className.split(/\s+/g).indexOf(value);
                },

                item: function(i) {
                    return self.className.split(/\s+/g)[i] || null;
                },

                remove: update(function(classes, index) {
                    if (~index) classes.splice(index, 1);
                }),

                toggle: update(function(classes, index, value) {
                    if (~index) { classes.splice(index, 1); } else { classes.push(value); }
                })
            };
        }
    });
}

// 使用 jQuery
$('#elementId').toggleClass('className');

// 使用原生 JavaScript 的 classList API
document.getElementById('elementId').classList.toggle('className');

<button id="toggleButton">Toggle Class</button>
<div id="targetElement" class="initial-class">Content</div>

<script>
document.getElementById('toggleButton').addEventListener('click', function() {
    document.getElementById('targetElement').classList.toggle('active-class');
});
</script>