値に応じて、行または列にクラスを追加する方法はありますか。列「anzahl」が null の場合、行の背景色は「灰色」でなければならず、列「anzahl」の背景色は「赤」になります。
<body ng-app ng-init='articles = [
{"id":"1","name":"A&R","type":"P77 ","anzahl":"0"},
{"id":"2","name":"Accuphase","type":"AC5 ","anzahl":"1"},
{"id":"3","name":"Acoustical Systems","type":"Archon","anzahl":"1"}
]'>
<div class="container">
<table class="table">
<tr ng-repeat="article in articles">
<td>{{article.name}}</td>
<td>{{article.type}}</td>
<td>{{article.anzahl}}</td>
</tr>
</table>
</div>
</body>