/** * 獲取 blob * @param {String} url 目標檔案地址 * @return {cb} */ function getBlob(url,cb) { var xhr = new XMLHttpRequest(); xhr.open('GET', url, true); xhr.responseType = 'blob'; xhr.onload = function() { if (xhr.status === 200) { cb(xhr.response); } }; xhr.send(); } /** * 儲存 * @param {Blob} blob * @param {String} filename 想要儲存的檔名稱 */ function saveAs(blob, filename) { if (window.navigator.msSaveOrOpenBlob) { navigator.msSaveBlob(blob, filename); } else { var link = document.createElement('a'); var body = document.querySelector('body'); link.href = window.URL.createObjectURL(blob); link.download = filename; // fix Firefox link.style.display = 'none'; body.appendChild(link); link.click(); body.removeChild(link); window.URL.revokeObjectURL(link.href); }; } /** * 下載 * @param {String} url 目標檔案地址 * @param {String} filename 想要儲存的檔名稱 */ function download(url, filename) { getBlob(url, function(blob) { saveAs(blob, filename); }); }; download('https://www.baidu.com/img/[email protected]', 'ab.png')

來源:https://www.cnblogs.com/vipzhou/p/10700130.html