f loop is activated, autoTyper will start over
            flipflop: false // if flipflop is activated, letters which are typed animated will be removed ony by one animated
        };  

        var typer = new autoTyper(options);
        typer.start()

        // 弹窗
        $('.media_js_btn').click(function(){
            $('.media_mask_modal').addClass('show')
        })
        $('.modal_close_btn').click(function(){
            $('.media_mask_modal').removeClass('show')
        })
    