You have to use ng-class
<tr ng-repeat="list in results">
<td ng-class='{red : list.changeColor, black: !list.changeColor}'>{{list.value}}</td>
<td>{{list.price}}</td>
</tr>
CSS
<style type="text/css">
.red {
color: red;
}
.black {
color: black;
}
</style>