Question

我怎样才能让John，Liza，Peter在for循环之外？

var siblings = ["John", "Liza", "Peter"];

    for (var i=0; i < siblings.length; i++) {

      names = siblings[i];
      console.log(names) // correctly outputs John, Liza, Peter     
    }
console.log(names) // only gives Peter

更新：我试图在单元测试用例中重现问题。但这就是整个事情。

所以我发了一个请求，得到了一个数组

[ { kind: 'youtube#video',
    etag: '"sZ5p5Mo8dPpfIzLYQBF8QIQJym0/XDKLx9FZygpwjYlzaTU-HAH31tw"',
    id: 'b4Bj7Zb-YD4',
    snippet:
     { publishedAt: '2016-10-28T07:00:01.000Z',
       channelId: 'UCaHNFIob5Ixv74f5on3lvIw',
       title: 'Calvin Harris - My Way (Official Video)',
       description: 'Calvin Harris - My Way (Official Video)\nDownload My Way:  http://smarturl.it/CHMyWay?IQid=yt\nListen to My Way: http://smarturl.it/StreamCH?IQid=yt\n\n---------\n\nFollow Calvin Harris:\nFacebook: https://www.facebook.com/calvinharris/ \nTwitter: https://twitter.com/CalvinHarris \nInstagram: https://www.instagram.com/calvinharris/ \nWebsite: http://calvinharris.com/ \n\n---------\n\nCalvin Harris - My Way (Lyrics)\n\nWhy wait \nTo say\nAt least I did it my way \nLie awake \nTwo faced \nBut in my heart I understand \nI made \nMy move \nAnd it was all about you \nNow I feel \nSo far removed \n\nYou were the one thing in my way \n\nMy way\nAway away away',
       thumbnails: [Object],
       channelTitle: 'CalvinHarrisVEVO',
       tags: [Object],
       categoryId: '10',
       liveBroadcastContent: 'none',
       localized: [Object] },
    statistics:
     { viewCount: '8313145',
       likeCount: '271119',
       dislikeCount: '7364',
       favoriteCount: '0' } },
  { kind: 'youtube#video',
    etag: '"sZ5p5Mo8dPpfIzLYQBF8QIQJym0/c2pD6DG-ieqcYFEcGjGB31NYRKk"',
    id: '0zGcUoRlhmw',
    snippet:
     { publishedAt: '2016-10-24T14:00:01.000Z',
       channelId: 'UCRzzwLpLiUNIs6YOPe33eMg',
       title: 'The Chainsmokers - Closer ft. Halsey',
       description: 'Collage EP: \nPre-order on Amazon: http://smarturl.it/CollageAmz\nUrban Outfitters White Vinyl:  http://smarturl.it/CollageVinyl\n\n"Closer" ft. Halsey\niTunes: http://smarturl.it/CloseriT\nSpotify: http://smarturl.it/CloserStream\nApple Music: http://smarturl.it/CloserAM\nAmazon: http://smarturl.it/CloserAmz\n\nDirected by: Dano Cerny\n\nFollow The Chainsmokers:\nhttp://www.youtube.com/thechainsmokers\nhttp://www.twitter.com/thechainsmokers\nhttp://www.facebook.com/thechainsmokers\nhttp://www.instagram.com/thechainsmokers\nhttp://www.soundcloud.com/thechainsmokers\n\nFollow Halsey:\nTwitter: http://twitter.com/halsey\nFacebook: https://www.facebook.com/HalseyMusic\nInstagram: http://instagram.com/iamhalsey\nSpotify: http://smarturl.it/HalseySpotify\nNewsletter: http://www.iamhalsey.com/mailinglist\nPurchase Music: http://www.iamhalsey.com/badlandsbox',
       thumbnails: [Object],
       channelTitle: 'ChainsmokersVEVO',
       tags: [Object],
       categoryId: '10',
       liveBroadcastContent: 'none',
       localized: [Object] },
    statistics:
     { viewCount: '21315027',
       likeCount: '573642',
       dislikeCount: '19913',
       favoriteCount: '0',
       commentCount: '40899' } } 
]

所以我把它放在一个变量中，例如兄弟姐妹。然后我遍历整个数组，获取snippet.title，snippet.publishedAt。到目前为止一切都很好。但是我想将它推入一个新的数组，并使其可用于循环的OUTSIDE。

截至目前我的代码：

listVideos是我之前粘贴的一块。

listVideos.forEach(function list(item) {
    data = new Array();
    title = item.snippet.title; 
    return data.push(title);

    });
console.log(data); // only gives first title. I want to get all titles in an array stored inside data. And make data available globally

在开头设置变量var数据对我来说不起作用，因为我在forEach循环之外还有其他函数。因此，它必须是一种灵活的方式，我可以移动到任何我想要的地方，例如某种功能范围。

感谢。

Answer 1

它只说彼得，因为每次循环迭代你都会设置名称＆＃39;到那个特定的名字。如果你想获得所有的名字，那么＆＃39;名字＆＃39;必须是一个数组，你应该在循环中推送名称：

names.push(siblings[i])

Answer 2

var names = new Array();
names.push(siblings[i]);
console.log(names);

Answer 3

你不需要循环：

var elements =  document.getElementById("newsletter-builder-area-center-frame-content").querySelectorAll("div.sim-row.ui-draggable");

for (var i = 0; i < elements.length; i++) {
    var element = elements[i];
      var hola = element.getAttribute("hola");
        alert("Name: "+hola+"\r\n");
        // var  data_template['id_template']=hola;
        var source_ = element.querySelectorAll('.sim-row-edit');
        alert( source_.length);
            for (var ab = 0; ab < source_.length; ab++) {
            var source = source_[ab];
            var type_source=source.getAttribute("data-type");
            if (type_source === "image"){
                var value=source.getAttribute("src");
                alert(source);
                alert(value);
            }
            else if (type_source === "image-link"){
                //  $(this).parent().parent();
                var href_source=source.nextSibling.getAttribute('href');
                var source_image=source.nextSibling.getAttribute('src');
                alert(href_source);
                alert(source_image);
            }
            else if(type_source === "link"){
                var url=source.getAttribute("href");
                var text_url=source.textContent;
                var value=url+';'+text_url;
                alert(value);
            }
            else if(type_source === "text"){
                var value=source.innerHTML;
                alert(value);
            }
            else if(type_source === "title"){
                var value=source.textContent;
                alert(value);
            }
            // var data_template[type_source_+ab]=value;
        }
    }

在循环外访问javascript变量

3 个答案: