<wxs src="../common/utils/filter.wxs" module="format"></wxs>
  <view class="text-lg text-black">
          <text>{{format.cutString(newsItem.title,27)}}</text>
  </view>
在组建中采用cutString，控制台报错
[渲染层错误] TypeError: Cannot read property 'length' of undefined
    at cutString
    at ./component/news-item.wxml:9:17(env: Windows,mp,1.05.2111300; lib: 2.19.5)