使用jquery ajax get方法为什么页面自动刷新？

Question

$(document).on('click','#export',() => {
        $.get('/workspace/export');
    });

router.get('/export',function(req, res, next){

    var filepath = '/workspace/export/export.mp4'; 

   
    res.download(filepath, err => {
        console.log(err);
        res.sendStatus(404);
    })
});