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<script language="javascript" type="text/javascript" src="/template/pc/js/jquery-3.4.0.min.js"></script>
    <script>
      // 水印配置（可根據(jù)需求修改）
const WATERMARK_CONFIG = {
    logoUrl: 'http://snbccn2.lcbpsports.com/template/pc/images/logoB.png', // 替換為你的LOGO圖片URL
    opacity: 0.3,        // 水印透明度（0-1）
    rotation: -45,       // 傾斜角度（-90到90）
    horizontalGap: 200,  // 水平間隔（px）
    verticalGap: 150     // 垂直間隔（px）
};

// 僅攔截帶有class="down_btns"的<a>標(biāo)簽
document.addEventListener('click', async (e) => {
    // 查找最接近的帶有down_btns類的<a>標(biāo)簽
    const link = e.target.closest('a.down_btns');
    if (link && link.href) {
        const href = link.href;
        const filename = getFilenameFromUrl(href);
        const fileType = getFileType(filename);

// 判斷是否需要加水印的文件類型
        const supportedTypes = ['pdf', 'jpg', 'jpeg', 'png', 'xlsx', 'docx'];
        if (supportedTypes.includes(fileType)) {
            e.preventDefault(); // 阻止默認(rèn)下載行為
            try {
                await processDownloadWithWatermark(href, filename, fileType);
            } catch (error) {
                console.error('水印添加失敗:', error);
                // 失敗則打開(kāi)原始鏈接
                window.open(href);
            }
        }
    }
});

// 從URL中提取文件名
function getFilenameFromUrl(url) {
    const urlParts = url.split('/');
    return urlParts[urlParts.length - 1].split('?')[0];
}

// 獲取文件類型（擴(kuò)展名）
function getFileType(filename) {
    return filename.split('.').pop().toLowerCase();
}

// 處理下載并添加水印
async function processDownloadWithWatermark(url, filename, fileType) {
    console.log(`開(kāi)始處理文件: ${filename}, 類型: ${fileType}`);

// 下載原始文件
    const response = await fetch(url);
    const blob = await response.blob();

// 根據(jù)文件類型添加水印
    let watermarkedBlob;

switch (fileType) {
        case 'pdf':
            watermarkedBlob = await addWatermarkToPDF(blob);
            break;
        case 'jpg':
        case 'jpeg':
        case 'png':
            watermarkedBlob = await addWatermarkToImage(blob, fileType);
            break;
        case 'xlsx':
            watermarkedBlob = await addWatermarkToExcel(blob);
            break;
        case 'docx':
            // Word文件前端無(wú)法直接處理，需要后端支持
            alert('Word文件需要后端處理，正在打開(kāi)原始文件');
            window.open(url);
            return;
        default:
            // 不支持的類型直接下載
            saveAs(blob, filename);
            return;
    }

// 下載帶水印的文件
    saveAs(watermarkedBlob, `watermarked_${filename}`);
}

// 為PDF添加水印
async function addWatermarkToPDF(pdfBlob) {
    // 加載pdf-lib庫(kù)（動(dòng)態(tài)加載）
    if (typeof PDFLib === 'undefined') {
        await loadScript('https://cdn.bootcdn.net/ajax/libs/pdf-lib/1.17.1/pdf-lib.min.js');
    }

const arrayBuffer = await pdfBlob.arrayBuffer();
    const pdfDoc = await PDFLib.PDFDocument.load(arrayBuffer);
    const pages = pdfDoc.getPages();

// 加載LOGO圖片
    const logoResponse = await fetch(WATERMARK_CONFIG.logoUrl);
    const logoArrayBuffer = await logoResponse.arrayBuffer();
    const logoImage = await pdfDoc.embedPng(logoArrayBuffer);

// 為每一頁(yè)添加水印
    pages.forEach((page) => {
        const { width, height } = page.getSize();
        const logoWidth = 80;
        const logoHeight = 80;

// 平鋪水印
        for (let x = 0; x < width; x += WATERMARK_CONFIG.horizontalGap) {
            for (let y = 0; y < height; y += WATERMARK_CONFIG.verticalGap) {
                page.saveGraphicsState();
                page.setOpacity(WATERMARK_CONFIG.opacity);
                page.translate(x + logoWidth / 2, y + logoHeight / 2);
                page.rotate(WATERMARK_CONFIG.rotation);
                page.drawImage(logoImage, {
                    x: -logoWidth / 2,
                    y: -logoHeight / 2,
                    width: logoWidth,
                    height: logoHeight
                });
                page.restoreGraphicsState();
            }
        }
    });

// 保存并返回Blob
    const pdfBytes = await pdfDoc.save();
    return new Blob([pdfBytes], { type: 'application/pdf' });
}

// 為圖片添加水印
async function addWatermarkToImage(imageBlob, fileType) {
    return new Promise((resolve, reject) => {
        const reader = new FileReader();
        reader.onload = async (e) => {
            try {
                const img = new Image();
                img.onload = () => {
                    // 創(chuàng)建Canvas
                    const canvas = document.createElement('canvas');
                    canvas.width = img.width;
                    canvas.height = img.height;
                    const ctx = canvas.getContext('2d');

// 繪制原始圖片
                    ctx.drawImage(img, 0, 0);

// 加載LOGO圖片
                    const logoImg = new Image();
                    logoImg.crossOrigin = 'anonymous';
                    logoImg.onload = () => {
                        const logoWidth = 80;
                        const logoHeight = 80;

// 設(shè)置透明度
                        ctx.globalAlpha = WATERMARK_CONFIG.opacity;

// 平鋪水印
                        for (let x = 0; x < canvas.width; x += WATERMARK_CONFIG.horizontalGap) {
                            for (let y = 0; y < canvas.height; y += WATERMARK_CONFIG.verticalGap) {
                                ctx.save();
                                ctx.translate(x + logoWidth / 2, y + logoHeight / 2);
                                ctx.rotate((WATERMARK_CONFIG.rotation * Math.PI) / 180);
                                ctx.drawImage(logoImg, -logoWidth / 2, -logoHeight / 2, logoWidth, logoHeight);
                                ctx.restore();
                            }
                        }

// 轉(zhuǎn)換為Blob并返回
                        canvas.toBlob((blob) => {
                            resolve(blob);
                        }, `image/${fileType}`);
                    };
                    logoImg.src = WATERMARK_CONFIG.logoUrl;
                };
                img.src = e.target.result;
            } catch (error) {
                reject(error);
            }
        };
        reader.readAsDataURL(imageBlob);
    });
}

// 為Excel添加水印
async function addWatermarkToExcel(excelBlob) {
    // 加載必要的庫(kù)
    if (typeof ExcelJS === 'undefined') await loadScript('https://cdn.bootcdn.net/ajax/libs/exceljs/4.3.0/exceljs.min.js');
    if (typeof saveAs === 'undefined') await loadScript('https://cdn.bootcdn.net/ajax/libs/file-saver/2.0.5/FileSaver.min.js');

const workbook = new ExcelJS.Workbook();
    await workbook.xlsx.load(await excelBlob.arrayBuffer());

// 加載LOGO圖片
    const logoResponse = await fetch(WATERMARK_CONFIG.logoUrl);
    const logoBuffer = await logoResponse.arrayBuffer();

// 為每個(gè)工作表添加水印
    workbook.eachSheet((worksheet) => {
        const imageId = workbook.addImage({
            buffer: logoBuffer,
            extension: 'png'
        });
        worksheet.addBackgroundImage(imageId);
    });

// 保存并返回Blob
    const buffer = await workbook.xlsx.writeBuffer();
    return new Blob([buffer], { type: 'application/vnd.openxmlformats-officedocument.spreadsheetml.sheet' });
}

// 動(dòng)態(tài)加載腳本
function loadScript(src) {
    return new Promise((resolve, reject) => {
        const script = document.createElement('script');
        script.src = src;
        script.onload = resolve;
        script.onerror = reject;
        document.head.appendChild(script);
    });
}

// 文件保存函數(shù)
function saveAs(blob, filename) {
    const url = URL.createObjectURL(blob);
    const link = document.createElement('a');
    link.href = url;
    link.download = filename;
    document.body.appendChild(link);
    link.click();
    document.body.removeChild(link);
    URL.revokeObjectURL(url);
}

</script>
	
</html>

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