问题：内容为一条消息或少条消息时，内容会上推为空，内容多时不影响。

• 当前 Bug 的表现（可附上截图）

• 预期表现

• 复现路径

• 提供一个最简复现 Demo

.js代码：

//输入框焦点键盘高度

textFocus: function(e) {

let keyBarHeight = e.detail.height;

if (that.data.isMi) {

that.setData({

keyBarHeight: keyBarHeight

});

} else if (that.data.isMi6x) {

that.setData({

keyBarHeight: keyBarHeight + 100

});

};

},

.wxml代码：

<!–编写消息–>

<form bindsubmit=“bindConfirmBtn”>

<view class=‘speak’ style=‘bottom:{{keyBarHeight + “px;”}}’>

<image class=‘photo’ src=’/images/im_photo.png’ catchtap=‘selPhoto’></image>

<input type=‘text’ class=‘input’ name=“textarea” placeholder=‘输入内容’ cursor-spacing=’{{iPhone ? “14” : “10”}}’ confirm-type=‘send’ confirm-hold=‘true’ value=’{{msgContent}}’ adjust-position=’{{true}}’ bindfocus=‘textFocus’ bindblur=‘textBlur’ bindconfirm=“bindConfirm”></input>

<button form-type=“submit” class=‘sub’>发送</button>

</view>

</form>