js 下载url路径文件

function downloadFile(url, filename) {
    const link = document.createElement('a');
    link.href = url;
    link.download = filename;
    document.body.appendChild(link);
    link.click();
    document.body.removeChild(link);
}

async function downloadFile(url, filename) {
    const response = await fetch(url);
    const blob = await response.blob();
    const link = document.createElement('a');
    link.href = URL.createObjectURL(blob);
    link.download = filename;
    document.body.appendChild(link);
    link.click();
    document.body.removeChild(link);
}

function downloadFile(url, filename) {
    const xhr = new XMLHttpRequest();
    xhr.open('GET', url, true);
    xhr.responseType = 'blob';
    xhr.onload = function() {
        if (this.status === 200) {
            const blob = this.response;
            const link = document.createElement('a');
            link.href = URL.createObjectURL(blob);
            link.download = filename;
            document.body.appendChild(link);
            link.click();
            document.body.removeChild(link);
        }
    };
    xhr.send();
}

async function downloadLargeFile(url, filename) {
    try {
        const response = await fetch(url, { mode: 'cors' });
        if (!response.ok) throw new Error('Network response was not ok');
        const contentLength = response.headers.get('content-length');
        let receivedLength = 0;
        const reader = response.body.getReader();
        const chunks = [];
        while (true) {
            const { done, value } = await reader.read();
            if (done) break;
            chunks.push(value);
            receivedLength += value.length;
            console.log(`Received ${receivedLength} of ${contentLength}`);
        }
        const blob = new Blob(chunks);
        const link = document.createElement('a');
        link.href = URL.createObjectURL(blob);
        link.download = encodeURIComponent(filename);
        document.body.appendChild(link);
        link.click();
        document.body.removeChild(link);
    } catch (error) {
        console.error('Download failed:', error);
    }
}