downFiles(row){
if(row.fileUrl){
let link = document.createElement('a')
let url = row.fileUrl
fetch(url).then(res => res.blob()).then(blob => { // 将链接地址字符内容转变成blob地址
link.href = URL.createObjectURL(blob)
console.log(link.href)
link.download = ''
document.body.appendChild(link)
link.click()
})
}
},