index.php

        <!DOCTYPE html>
        <html lang="en">
        <head>
            <meta charset="UTF-8">
            <meta http-equiv="X-UA-Compatible" content="IE=edge">
            <meta name="viewport" content="width=device-width, initial-scale=1.0">
            <title>Document</title>
        </head>
        <body>
            <input class="download" type="button" value="下载1" dl="1.zip">
            <input class="download" type="button" value="下载2" dl="2.xlsx">
            <script src="jquery-3.6.0.js"></script>
            <script>
                $(".download").click(function(){
                    var str = $(this).attr("dl");
                    $(location).attr("href","download.php?dl="+str);
                });
            </script>
        </body>
        </html>

download.php

        <?php
        $file = $_GET["dl"];
        $fileinfo = finfo_open(FILEINFO_MIME_TYPE);
        $mineType = finfo_file($fileinfo,$file);
        finfo_close($fileinfo);
    
        // 告诉浏览器，文件的格式
        header("Conten-Type:".$mineType);
        // 告诉浏览器，文件名
        header("Content-Disposition:attachment;filename=".basename($file));
        // 告诉浏览器，文件大小
        header("Content-Length:".filesize($file));
        // 把文件发给浏览器
        readfile($file);
    
    
    ?>

index.php

download.php

下载文件自行考虑