ionic 文本添加清除功能

<div class="padding">
    <div class="item item-input" >
      <span class="input-label col-20">账号</span>
          <input type="text" placeholder="请输入登录账号"   ng-model="newUser.account">
          <i class="ion-close-circled" ng-click="newUser.account=''" ng-class="newUser.account.length>0?'show':'hide'" style="padding: 5px 10px; color: #ddd"></i>
    </div>
    <div class="item item-input">
      <span class="input-label col-20">密码</span>
      <input ng-model="newUser.password" type="password">
      <i class="ion-close-circled" placeholder="请输入登录密码"  ng-click="newUser.password=''" ng-class="newUser.password.length>0?'show':'hide'" style="padding: 5px 10px;color: #ddd"></i>
    </div>
    <button class="button button-full button-calm button-radius" ng-click="login(newUser)">登录</button>
    <p class="item-note" on-tap="customerService()">找回或修改密码</p>
</div>