來源: http://www.javashuo.com/article/p-mwuymggo-hx.htmlhtml
/** * 獲取 blob * @param {String} url 目標文件地址 * @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();
}
/** * 保存 * @param {Blob} blob * @param {String} filename 想要保存的文件名稱 */
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 目標文件地址 * @param {String} filename 想要保存的文件名稱 */
function download(url, filename) {
getBlob(url, function(blob) {
saveAs(blob, filename);
});
};
download('https://www.baidu.com/img/baidu_resultlogo@2.png', 'ab.png')