input 双向绑定 没用效果，具体怎么实现？

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input 双向绑定 没用效果，具体怎么实现？Input two-way binding is useless, how to achieve it?

         class=   "manual-record-field">           <van-field label="手机" model:value="{{ phone }}" placeholder="请输入手机号码" required />           view>       <view class="manual-record-field">           <van-field label="地址" model:value="{{ addr }}" placeholder="请输入用户地址" required />           view>  

Class = "manual record field" > < van field label = "mobile phone" model:value= "{phone}}" placeholder = please enter the mobile phone number "required / > View > < view class =" manual record field "> < van field label = address" model:value= "{{addr}}" placeholder = please enter the user address "required / > View >

回答：

小程序没有提供过这种方法的model:value="{{ phone }}"