在父函数之外使用数组

Question

with this function triggered as a callback

 var testing  = []; 
 var vid;

function showMyVideos(data){

        var feed = data.feed; //object "feed"
        var entries = feed.entry || [];   //array "entry"
        var html = ['<ul>'];
        for (var i = 0; i < entries.length; i++){
            entry = entries[i];
            playCount = entry.yt$statistics.viewCount.valueOf() + ' views';
            title = entry.title.$t;

            vid = (getVideoId(entry.link[0].href));
            testing[i] = vid;
            lnk = '<a href = \'' + entry.link[0].href + '\'>link</a>';
            html.push('<li>', title, ', ', playCount, ', ', vid, ', ', lnk, '</li>');

        }
        html.push('</ul>');
        $('#videoResultsDiv').html(html.join(''));


     }

---

I want to use the "testing" array on other functions, how will I do that?.. I'm frustrated now, sorry I'm just starting to appreciate JavaScript. I want to perfectly access the array data like when I'm doing on console.log(testing) inside the function..

Answer 1

"testing" is in the global scope and it should be accesible anywhere as long as there isn't another variable in another scope with the same name overriding the global "testing".

If the values aren't accesible in the place you are trying it, it could be because that function is getting executed before the callback loads the values in "testing".

Answer 2

As has been mentioned testing is global scope, so you can use it anywhere. So it's important that you have the correct execution order for the functions using testing .

Some might frown on using global scope in javascript but there are ways to mitigate issues.

Generally when I have to implement global scope vars, I will create a method along the lines of 'clear_session' or 'reset_globals'.

In your case a function like that would look like this:

function reset_globals(){
   testing  = []; 
   vid;
}

This is useful because then you know that after you call reset_globals() that your variables are going to be empty.