1 van-field组件，type设置为number时，用户还是可以输入非数字
<van-field model:value="{{ phone }}" label="手机号" input-align="left" type="number" placeholder="请输入手机号" maxlength = "11" use-button-slot > <van-button bindgetphonenumber="getPhoneNumber" open-type="getPhoneNumber" slot="right-icon" size="small" type="primary" >授权手机号</van-button> </van-field>
