【angular】angular如何让传递变量参数+ng-change的使用

HTML：

 1 <div class="form-group">
 2     <label class="col-sm-2 control-label">商户名称</label>
 3     <div class="col-sm-4">
 4          <input type="text" class="form-control " id="merchantName" ng-model="merchant.name"
 5                 ng-init="123" value="{{name}}" placeholder="请输入商户名称" 
 6                 ng-class="{'red-border':merchantNameState}" 
 7                 ng-change="tipState(this,'merchantNameState')">
 8      </div>
 9      <div class="col-md-4 red-font" ng-show="merchantNameState">请输入商户名称</div>
10 </div>

JS：

1 $scope.tipState=function (x,stateName) {
2       if(x.value!==''){
3            $scope[stateName]=false;
4       }
5  };

传递变量参数;

$scope[stateName]=false

ng-change的使用

必须定义ng-model