小程序 modal 模态框弹出键盘后,键盘遮挡问题(弹框上移)

<!-- 扫码输金额 -->
<modal hidden="{{hiddenmodalput}}" title="支付金额" confirm-text="确定" cancel-text="取消" bindcancel="cancel" bindconfirm="confirm">  
    <input type='number' bindinput='moneyInput' cursor-spacing='100' focus='{{focusValue}}' placeholder="请输入支付金额"/>  
</modal>  

data: {
    hiddenmodalput: true, 
    focusValue: false 

}
 /**
   * 扫码支付
   */
  scanCode: function (e) {
    // 允许从相机和相册扫码
    wx.scanCode({
      success: (res) => {
        console.log(res)
        this.setData({
          hiddenmodalput: false,
          focusValue: true
        });
      }
    })
  },