1:input元素的ng-model属性 用于实现input的双向绑定
<div ng-controller="TesrController">
<input type="text" ng-model = "ipt"></input>
<p>{{ipt}}</p>
</div>
<div ng-controller="TesrController">
<input type="text" ng-model = "ipt"></input>
<p>{{ipt}}</p>
</div>