JS弹出下载对话框，实现跨域第三方文件另存为

const downloadRes = async (url, name) => {
                    let response = await fetch(url);
                    let blob = await response.blob();
                    let objectUrl = window.URL.createObjectURL(blob);
                    let a = document.createElement('a');
                    a.href = objectUrl;
                    a.download = name;
                    document.body.appendChild(a);
                    a.click();
                    setTimeout(function () {
                        document.body.removeChild(a);
                    }, 1000);
                };

                downloadRes('文件url', '文件名');