ionic 文本添加清除功能

<div class="padding">    <div class="item item-input" >      <span class="input-label col-20">帐号</span>          <input type="text" placeholder="请输入登陆帐号"   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="请输入登陆密码"  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)">登陆</button>    <p class="item-note" on-tap="customerService()">找回或修改密码</p></div>