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<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
</head>
<body>
    <input type="button" onclick="downloadFile('./exam139.xlsx')" value="下载">
    <script>
        window.downloadFile = function (sUrl) {
        //iOS devices do not support downloading. We have to inform user about this.
        if (/(iP)/g.test(navigator.userAgent)) {
            alert('Your device does not support files downloading. Please try again in desktop browser.');
            return false;
        }

        //If in Chrome or Safari - download via virtual link click
        if (window.downloadFile.isChrome || window.downloadFile.isSafari) {
            //Creating new link node.
            var link = document.createElement('a');
            link.href = sUrl;

            if (link.download !== undefined) {
                //Set HTML5 download attribute. This will prevent file from opening if supported.
                var fileName = sUrl.substring(sUrl.lastIndexOf('/') + 1, sUrl.length);
                link.download = fileName;
            }

            //Dispatching click event.
            if (document.createEvent) {
                var e = document.createEvent('MouseEvents');
                e.initEvent('click', true, true);
                link.dispatchEvent(e);
                return true;
            }
        }

        // Force file download (whether supported by server).
        if (sUrl.indexOf('?') === -1) {
            sUrl += '?download';
        }

            window.open(sUrl, '_self');
            return true;
        }

        window.downloadFile.isChrome = navigator.userAgent.toLowerCase().indexOf('chrome') > -1;
        window.downloadFile.isSafari = navigator.userAgent.toLowerCase().indexOf('safari') > -1;
    </script>
</body>
</html>```

本文标签： 浏览器文件js

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