down () {
let request = new XMLHttpRequest()
request.responseType = 'blob'
// 传入文件链接
// request.open('GET', this.tokenData.serverUrl + item.path)
request.open('GET', 'https://img1.baidu.com/it/u=467403473,3088799256&fm=26&fmt=auto')
request.onload = function () {let url = window.URL.createObjectURL(this.response)
let a = document.createElement('a')
document.body.appendChild(a)
a.href = url
a.download = '图片'
a.click()}
request.send()
}