angularjs 模糊查询

接了一个需求，通过angularjs增加一个检索栏，检索数组并在列表中显示返回后的结果，代码：
html代码：

<ion-content>
  <div class="bar bar-header item-input-inset">
    <label class="item-input-wrapper" style="margin-right:16px">
      <i class="icon ion-ios-search-strong placeholder-icon"></i>
      <input id="search" type="search" placeholder="搜索" ng-model="searchCont.key" ng-change="search()">
    </label>
  </div>
<div class="list lr-list-radio">
  <lr-ion-radio ng-repeat="user in userlist" class="lrdadadad" ng-value="user.userId" ng-model="selectValue" ng-change="flowUserChange(user)">
    <div class="royal-bg bgcolor_a">{{ user.realName }}</div>
  </lr-ion-radio>
</div>
</ion-content>

js代码：

/*搜索开始*/
$scope.user = $scope.userlist;//待搜索数组
$scope.searchCont = {};//搜索内容
$scope.searchName = [];//搜索后页面遍历显示的数组  
$scope.search = function () {
  $scope.searchName = []; //每次搜索先清空数组内容  
  var searchValue = document.getElementById('search').value;
  for (var i = 0; i < $scope.user.length; i++) {
    if ($scope.user[i].realName.indexOf(searchValue) >= 0) {
      $scope.searchName.push($scope.user[i]);
    }
  }
  if (!searchValue) {
    $scope.userlist = $scope.user;
  } else {
    $scope.userlist = $scope.searchName;
  }
};
/*搜索结束*/