在 ang-repeat中，我想ng-class根据一些项目参数设置 a 的类名。
我想为每个添加性别和年龄对应类的简单示例<li>：
<div ng-init="friends = [
{name:'John', age:25, gender:'boy'},
{name:'Jessie', age:30, gender:'girl'},
{name:'Johanna', age:28, gender:'girl'},
{name:'Joy', age:15, gender:'girl'},
{name:'Mary', age:28, gender:'girl'},
{name:'Peter', age:95, gender:'boy'},
{name:'Sebastian', age:50, gender:'boy'},
{name:'Erika', age:27, gender:'girl'},
{name:'Patrick', age:40, gender:'boy'},
{name:'Samantha', age:60, gender:'girl'}
]">
I have {{friends.length}} friends. They are:
<input type="search" ng-model="q" placeholder="filter friends..." />
<ul class="example-animate-container">
<li class="animate-repeat" ng-repeat="friend in friends | filter:q" ng-class="friend.gender friend.name">
[{{$index + 1}}] {{friend.name}} who is {{friend.age}} years old.
</li>
</ul>
</div>
不幸的是，它似乎不是那样工作的。
知道如何简单地实现这一目标吗？