我使用简单的ng重复来生成国家列表。每个列表中都有一个隐藏的行/ div，可以展开和折叠。
我面临的问题是，在我将Angular引入我的应用程序之前，我手动硬编码元素的ID，例如：
<li data-show="#country1">
{{country.name}} has population of {{country.population}}
<div id="country1">
<p>Expand/collapse content
</div>
</li>
<li data-show="#country2">
{{country.name}} has population of {{country.population}}
<div id="country2">
<p>Expand/collapse content
</div>
</li>
<li data-show="#country3">
{{country.name}} has population of {{country.population}}
<div id="country3">
<p>Expand/collapse content
</div>
</li>
<li data-show="#country4">
{{country.name}} has population of {{country.population}}
<div id="country4">
<p>Expand/collapse content
</div>
</li>
使用ng-repeat的新代码：
<li ng-repeat="country in countries" data-show="????">
{{country.name}} has population of {{country.population}}
<div id="???">
<p>Expand/collapse content
</div>
</li>
我如何在我的ng重复中分配动态/增量ID？
您可以使用$ index
https://docs.angularjs.org/api/ng/directive/ngRepeat
<li ng-repeat="country in countries" data-show="????">
{{country.name}} has population of {{country.population}}
<div id="country-{{$index}}">
<p>Expand/collapse content
</div>
</li>