第一步
先把要下载的模板放在public目录下
第二步
使用如下方法download()进行下载，其中url前加上`${process.env.BASE_URL}`，例如`${process.env.BASE_URL}fileResources/template.xlsx`,
function download (url, filename) {
const anchor = document.createElement("a");
anchor.href = url;
anchor.setAttribute("download", filename);
anchor.innerHTML = "downloading...";
anchor.style.display = "none";
document.body.appendChild(anchor);
setTimeout(() => {
anchor.click();
document.body.removeChild(anchor);
setTimeout(() => { self.URL.revokeObjectURL(anchor.href); }, 250);
}, 66);
}