javascript-如何从AngularJS模板中的嵌套JSON数组中获取价值？

我下面有一些JSON数据：

{
"tracks": [
    {
        "album": {
            "released": "2013",
            "href": "spotify:album:3qGeRY1wt4rrLIt1YuSwHR",
            "name": "The Marshall Mathers LP2 (Deluxe)",
            "availability": {
                "territories": "AD AR AT AU BE BG BO BR CH CL CO CR CY CZ DE DK DO EC EE ES FI FR GB GR GT HK HN HR HU IE IS IT LI LT LU LV MC MT MY NI NL NO NZ PA PE PH PL PT PY RO SE SG SI SK SV TR TW UY"
            }
        },
        "name": "The Monster",
        "popularity": "0.94",
        "external-ids": [
            {
                "type": "isrc",
                "id": "USUM71314082" <-- I want this value
            }
        ],
        "length": 250.188,
        "href": "spotify:track:5U8hKxSaDXB8cVeLFQjvwx",
        "artists": [
            {
                "href": "spotify:artist:7dGJo4pcD2V6oG8kP0tJRR",
                "name": "Eminem"
            },
            {
                "href": "spotify:artist:5pKCCKE2ajJHZ9KAiaK11H",
                "name": "Rihanna"
            }
        ],
        "track-number": "12"
    },
    ...
]}

我可以取出其他值,例如专辑名称,发行日期等,但不能提取外部ID.这是我在角度模板中尝试的两种方法：

<div class="panel panel-success" ng-repeat="track in something.tracks">
    <p>Track name: {{ track.name }}</p>
    <p>Album release date: {{ track.album.released }}</p>
    <p>Spotify id: {{track.external-ids[0].id}} </p>

    <!-- <span ng-repeat="obj in track.external-ids">  
            <p>Spotify id: {{ obj.id }}</p>
        </span> -->

</div>

这些是我想出的两个解决方案,但似乎都不起作用.第一个(未注释掉)返回0,第二个完全不显示“ spotify id：”行.

有人知道怎么做这个吗？似乎很简单,但我似乎无法解决.谢谢.

解决方法:

要访问包含破折号的属性,您需要使用方括号符号：

<p>Spotify id: {{track['external-ids'][0].id}} </p>

否则,解析器将解释为减法运算符：

track.external - ids[0].id

演示：http://plnkr.co/edit/gIyXg8y0Pn1TuK0uI6qD?p=preview

标签：angularjs,ng-repeat,json,javascript
来源： https://codeday.me/bug/20191121/2055725.html