js+http下载

function downloadFile(url, filename) {
    var xhr = new XMLHttpRequest();
    xhr.open('GET', url, true);
    xhr.responseType = 'blob';
    xhr.onload = function() {
        if (this.status === 200) {
            var blob = new Blob([this.response], {type: 'application/octet-stream'});
            var link = document.createElement('a');
            link.href = window.URL.createObjectURL(blob);
            link.download = filename;
            link.click();
        }
    };
    xhr.send();
}

// 使用方法
downloadFile('http://example.com/file.pdf', 'downloaded-file.pdf');

function downloadFile(url, filename) {
    fetch(url)
        .then(response => response.blob())
        .then(blob => {
            var link = document.createElement('a');
            link.href = window.URL.createObjectURL(blob);
            link.download = filename;
            link.click();
        })
        .catch(error => console.error('下载失败:', error));
}

// 使用方法
downloadFile('http://example.com/file.pdf', 'downloaded-file.pdf');