- 当前 Bug 的表现（可附上截图）
通过绑定属性时候触发的 bindlinechange 事件带的lineCount是错误。输入时候触发的没有问题。
在开发工具，只有第一次绑定计算错误。 在ios真机，每次绑定时候触发的都是错误。


- 预期表现




- 复现路径
所以，连续调用两次，在开发工具lineCount返回是正确的，但真机还是不行。


- 提供一个最简复现 Demo
wxml:
<br><view class="{{greeting_lineCount>4?'warning':''}}" > 最多显示4行，目前{{greeting_lineCount}}行</view><br><br><br>.js<br>this.setData({<br>greeting: this.data.album.setting[key] || '',<br>});<br><br><br>this.setData({<br>greeting: this.data.album.setting[key] || '',<br>});<br><br><br>txtlinechange: function(e){<br>console.log('e.detail.lineCount:',e.detail.lineCount)<br>this.setData({<br>greeting_lineCount: e.detail.lineCount<br>})<br>},<br><br><br><h3>微信小程序开发问题解答</h3><br><div class="toux"><span class="huifu">微信小程序开发者回答：</span><p><br>提供一下出现问题的机型和微信版本，以及能复现问题的简单代码片段（https://developers.weixin.qq.com/miniprogram/dev/devtools/minicode.html）。<br><br> </div> <br> 本文网址：http://www.91bianli.com/weixinxiaochengxu/14054.html <br><br><br> <div class="art_sxp"> <div class="art_sxp_l">上一篇：<a href='/weixinxiaochengxu/14053.html'>iOS虚拟支付整改完成，望二次审核</a> </div> <div class="art_sxp_r">下一篇：<a href='/weixinxiaochengxu/14055.html'>IOS 上的showmodle问题 按钮字体为白色</a> </div> </div> </ul> </div> </div> <div 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