我使用以下代码下载blobs并在下载后撤销对象URL。它在Chrome和Firefox中工作!

function download(blob){
    var url = URL.createObjectURL(blob);
    console.log('create ' + url);

    window.addEventListener('focus', window_focus, false);
    function window_focus(){
        window.removeEventListener('focus', window_focus, false);
        URL.revokeObjectURL(url);
        console.log('revoke ' + url);
    }
    location.href = url;
}

关闭文件下载对话框后，窗口将获得其焦点，因此将触发焦点事件。

如果XMLHttpRequest和一个blob不是一个选项，那么你可以在一个新窗口中打开你的文件，并检查是否有任何元素被填充到该窗口体中。

var form = document.getElementById("frmDownlaod"); form.setAttribute("action", "downoad/url"); form.setAttribute("target", "downlaod"); var exportwindow = window.open("", "downlaod", "width=800,height=600,resizable=yes"); form.submit(); var responseInterval = setInterval(function() { var winBody = exportwindow.document.body if(winBody.hasChildNodes()) // Or 'downoad/url' === exportwindow.document.location.href { clearInterval(responseInterval); // Do your work. // If there is an error page configured in your application // for failed requests, check for those DOM elements. } }, 1000) // Better if you specify the maximum number of intervals

基于Elmer的例子，我准备了自己的解决方案。单击具有定义的“download”类的项目后，浏览器窗口中将显示一条自定义消息。我用焦点触发器隐藏了消息。我用焦点触发器隐藏了消息。

JavaScript

$(function(){$('.download').click(function() { ShowDownloadMessage(); }); })

function ShowDownloadMessage()
{
     $('#message-text').text('Your report is creating. Please wait...');
     $('#message').show();
     window.addEventListener('focus', HideDownloadMessage, false);
}

function HideDownloadMessage(){
    window.removeEventListener('focus', HideDownloadMessage, false);                   
    $('#message').hide();
}

HTML

<div id="message" style="display: none">
    <div id="message-screen-mask" class="ui-widget-overlay ui-front"></div>
    <div id="message-text" class="ui-dialog ui-widget ui-widget-content ui-corner-all ui-front ui-draggable ui-resizable waitmessage">please wait...</div>
</div>

现在你应该实现任何元素来下载:

<a class="download" href="file://www.ocelot.com.pl/prepare-report">Download report</a>

or

<input class="download" type="submit" value="Download" name="actionType">

每次点击下载后，您将看到消息: 您的报告正在创建中。请稍等…

您可以依赖浏览器的缓存，并在文件加载到缓存时触发同一文件的第二次下载。

$('#link').click(function(e) {
    e.preventDefault();

    var url = $(this).attr('href');
    var request = new XMLHttpRequest();
    request.responseType = "blob";
    request.open("GET", url);

    var self = this;
    request.onreadystatechange = function () {
        if (request.readyState === 4) {
            var file = $(self).data('file');
            var anchor = document.createElement('a');
            anchor.download = file;
            console.log(file);
            console.log(request);
            anchor.href = window.URL.createObjectURL(request.response);
            anchor.click();
            console.log('Completed. Download window popped up.');
        }
    };
    request.send();
});

我也遇到过同样的问题。我的解决方案是使用临时文件，因为我已经生成了一堆临时文件。提交表格时:

var microBox = {
    show : function(content) {
        $(document.body).append('<div id="microBox_overlay"></div><div id="microBox_window"><div id="microBox_frame"><div id="microBox">' +
        content + '</div></div></div>');
        return $('#microBox_overlay');
    },

    close : function() {
        $('#microBox_overlay').remove();
        $('#microBox_window').remove();
    }
};

$.fn.bgForm = function(content, callback) {
    // Create an iframe as target of form submit
    var id = 'bgForm' + (new Date().getTime());
    var $iframe = $('<iframe id="' + id + '" name="' + id + '" style="display: none;" src="about:blank"></iframe>')
        .appendTo(document.body);
    var $form = this;
    // Submittal to an iframe target prevents page refresh
    $form.attr('target', id);
    // The first load event is called when about:blank is loaded
    $iframe.one('load', function() {
        // Attach listener to load events that occur after successful form submittal
        $iframe.load(function() {
            microBox.close();
            if (typeof(callback) == 'function') {
                var iframe = $iframe[0];
                var doc = iframe.contentWindow.document;
                var data = doc.body.innerHTML;
                callback(data);
            }
        });
    });

    this.submit(function() {
        microBox.show(content);
    });

    return this;
};

$('#myForm').bgForm('Please wait...');

在生成文件的脚本的末尾:

header('Refresh: 0;url=fetch.php?token=' . $token);
echo '<html></html>';

这将导致iframe上的load事件被触发。然后关闭等待消息，然后开始文件下载。它在Internet Explorer 7和Firefox上进行了测试。

当按钮/链接被单击时创建一个iframe，并将其附加到body。

$('<iframe />')
    .attr('src', url)
    .attr('id', 'iframe_download_report')
    .hide()
    .appendTo('body');

创建一个延迟的iframe，下载后删除。

var triggerDelay =   100;
var cleaningDelay =  20000;
var that = this;
setTimeout(function() {
    var frame = $('<iframe style="width:1px; height:1px;" class="multi-download-frame"></iframe>');
    frame.attr('src', url + "?" + "Content-Disposition: attachment ; filename=" + that.model.get('fileName'));
    $(ev.target).after(frame);
    setTimeout(function() {
        frame.remove();
    }, cleaningDelay);
}, triggerDelay);