How to use the clipboard.default function in clipboard

constructor() {

        Dropzone.autoDiscover = false;
        this.poll = poll;

        new Clipboard('.tms-chat-direct .tms-clipboard')
            .on('success', function(e) {
                toastr.success('复制到剪贴板成功!');
            }).on('error', function(e) {
                toastr.error('复制到剪贴板失败!');
            });

        this.initSubscribeEvent();
    }

attached() {
        this.getBlog();

        new Clipboard('.em-blog-content .tms-clipboard')
            .on('success', function(e) {
                toastr.success('复制到剪贴板成功!');
            }).on('error', function(e) {
                toastr.error('复制到剪贴板失败!');
            });

        $('.em-blog-content').on('click', 'code[data-code]', function(event) {
            if (event.ctrlKey) {
                event.stopImmediatePropagation();
                event.preventDefault();
                clipboard.copy($(event.currentTarget).attr('data-code')).then(
                    () => { toastr.success('复制到剪贴板成功!'); },
                    (err) => { toastr.error('复制到剪贴板失败!'); }
                );
            }
        });