将xhr.responseURL保存到数组

Question

I have an array of URLs that i need to find the redirects for. I have been using XMLHttpRequest / xhr.responseURL to do so. When I print the results to the console, the redirected URLs display as expected. However, when I try to save those redirected URLs to an array, the array remains empty. How can I save them to the array?

Updated with code

var imageDestinations = [];

function imageDestinationGrabber(imageSource) {
    var xhr = new XMLHttpRequest();
    xhr.open('GET', imageSource, true);
    xhr.onload = function() {
    imageDestinations.push(xhr.responseURL).trim());
    console.log((xhr.responseURL).trim());
    };
    xhr.send(null);
}

The console log works, but the array remains empty.

Answer 1

You had a couple syntax issues that was breaking your code. You had an extra parenthesis at the end of your array push.

imageDestinations.push(xhr.responseURL).trim());

That is trying to .trim() the .push() call

Here's the fixed code:

 var imageDestinations = []; function imageDestinationGrabber(imageSource) { var xhr = new XMLHttpRequest(); xhr.open('GET', imageSource, true); xhr.onload = function() { imageDestinations.push( xhr.responseURL.trim() ); console.log( xhr.responseURL.trim() ); }; xhr.send(null); }