js implements file download function

//Download attachment

down(item) {

let that = this;

axios({

url: 'xxx',

method: 'xxx',

data: {xxx},

                        responseType: 'blob', // The data type returned by the server

                    }).then(function (res) {

try {

                            const objectUrl = URL.createObjectURL(new Blob([res.data]))

                            const link = document.createElement('a')

                            link.download = decodeURIComponent(res.headers['content-disposition'].split(';')[1].split('filename=')[1])

link.href = objectUrl

link.click()

                            window.URL.revokeObjectURL(link.href)

} catch (e) {

alertDanger('Download failed!');

}

})

                        .catch(function (err) {

alertDanger('Download failed!');

});