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我目前使用 html2canvas 来获取 div 作为图像。

        html2canvas([document.getElementById("board")],{
            onrendered: function( canvas ) {
                var img = canvas.toDataURL();

                var request = $.ajax({
                    type:"POST",
                    url:"downloadPic.php",
                    data:{downloadPic : img}
                });

然后，我想下载该图像（到浏览器默认下载目录）

if(isset($_POST['downloadPic'])){

    $pic = $_POST['downloadPic'];
    $filteredData=substr($pic, strpos($pic, ",")+1); //html2canvas adds this
    $unencodeData=base64_decode($filteredData);

    $filename = "downloadedPic";

        header('Content-Description: File Transfer');
        header('Content-Type: image/png');
        header('Content-Disposition: attachment; filename="'.basename($filename).'"');
        header('Content-Transfer-Encoding: binary');
        header('Expires: 0');
        header('Cache-Control: must-revalidate, post-check=0, pre-check=0');
        header('Pragma: public');
        header('Content-Length: ' . filesize($unencodeData));
        ob_clean();
        flush();
        readfile($unencodeData);

}

但这似乎不起作用。如果我执行 file_put_contents("downloadedPic", $unencodedData) 图片成功保存在我的服务器上。

我需要不同的标头配置吗？

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0 回答 0