layer子窗体ESC键关闭

<script>
        $(document).ready(function() {
            // 页面加载后立即聚焦到 body 或某个元素
            $('body').focus();
            
            // 或者聚焦到一个隐藏的 input 确保事件捕获
            $('<input type="text" style="position:absolute;opacity:0;">')
                .appendTo('body')
                .focus()
                .blur(); // 立即失去焦点但不影响事件监听
            
            $(document).keydown(function(e) {
                if (e.keyCode === 27) {
                    var index = parent.layer.getFrameIndex(window.name);
                    parent.layer.close(index);
                    return false; // 阻止事件冒泡
                }
            });
        });
        </script>