Blob createObjectURL download not working in Firef

问题:

I have an odd problem, the function below is one I created based on what i found on the net about creating a Blob in the client on the fly with some binary data in (passed as an array) and being able to download that. This works brilliantly in Chrome, but doesn't do anything in Firefox - UNLESS I debug and step through the code. Yes, oddly, if I create a break point inside the function and step through it, the a.click() will bring up the download window!

function downloadFile(filename, data) {

    var a = document.createElement('a');
    a.style = "display: none";  
    var blob = new Blob(data, {type: "application/octet-stream"});
    var url = window.URL.createObjectURL(blob);
    a.href = url;
    a.download = filename;
    document.body.appendChild(a);
    a.click();
    document.body.removeChild(a);
    window.URL.revokeObjectURL(url);    
}

Can anyone help me? This was tested using Firefox 38.0.5.

回答1:

You're probably removing the resource too soon, try delaying it

    ...
    a.click();
    setTimeout(function(){
        document.body.removeChild(a);
        window.URL.revokeObjectURL(url);  
    }, 100);  
}

回答2:

The above didn't solve the issue for me. But this one did instead:
Programmatical click on <a>-tag not working in Firefox
It was a problem with the triggering click event, not premature removal of the resource.

回答3:

this solution works for me in bot chrome and firefox for existing anchor element to download binary file

window.URL = window.URL || window.webkitURL;

var blob = new Blob([new Uint8Array(binStream)], {type: "octet/stream"});

var link = document.getElementById("link");
link.href = window.URL.createObjectURL(blob);