如何使用AngularJS选择输入值的背景颜色？

Question

我从Js函数中选择了用户当前输入字段是readOnly，所以一旦我们从selectedOwner获得值，我想将输入字段背景颜色更改为白色，因为用户不希望看到灰色来自readOnly指令？有没有办法实现这种要求？

main.html中

<div class="form-group col-md-6">
                    <div class="col-md-6">
                        <label class="control-label required" for="rcsaOwner">RCSA
                            Owner :</label>
                    </div>
                    <div class="col-md-6">
                        <input type="text" class="form-control" id="rcsaOwner" required ng-class="{'background1': color.back}"
                            ng-model="riskAssessmentDTO.rcsaOwnerWorker" name="rcsaOwnerWorker"
                            ng-click="openRcsaOwner()" ng-model-options="{updateOn: 'blur'}" ng-readOnly="true"/>
                        <p class="text-danger"
                            ng-show="addAssessment.rcsaOwnerWorker.$touched && addAssessment.rcsaOwner.$error.required">RCSA
                            Owner is required</p>
                    </div>
                </div>

mainCtrl.Js

    $scope.selectedOwner = function (selectedOwner, workerKey) {
        this.$parent.$parent.rcsaOwnerModal.close();
        $scope.riskAssessmentDTO.rcsaOwnerWorkerKey = workerKey;
        $scope.riskAssessmentDTO.rcsaOwnerWorker = selectedOwner;
        $scope.color = { back: true};
    };

的main.css

.background1 {
      background-color: #eeee12;
      color: red;

}