下载js

download(url, params = {}, fileName = '') {

        return axios({

            url: url,

            method: 'post',

            params,

            responseType: "arraybuffer"

        }).then(res => {

            const content = res;

            const blob = new Blob([content]);

            if ('msSaveOrOpenBlob' in navigator) {

                window.navigator.msSaveOrOpenBlob(blob, fileName);

                return;

            }

            const elink = document.createElement("a");

            elink.download = fileName;

            elink.style.display = "none";

            elink.href = URL.createObjectURL(blob);

            document.body.appendChild(elink);

            elink.click();

            URL.revokeObjectURL(elink.href);

            document.body.removeChild(elink);

        });

    }