点击按钮,进行其他操作之后,自动下载
let link = document.createElement('a');
link.style.display = 'none';
link.href = url;
document.body.appendChild(link);
link.click();
let link = document.createElement('a');
link.style.display = 'none';
link.href = url;
document.body.appendChild(link);
link.click();