uniapp警告 Unhandled error during execution of watcher callback

回答: 在uniapp中，当执行watcher回调时出现了未处理的错误，导致了警告信息"Unhandled error during execution of watcher callback"。这个问题可能是由于在渲染Echarts图表时，数据还未获取到就开始渲染导致的。为了解决这个问题，可以在数据渲染之前进行非空判断，例如使用if语句进行判断，只有在数据存在的情况下才开始渲染数据。比如可以使用以下代码进行判断：

if(value){
  // 开始渲染数据
}

或者使用以下代码进行判断：

if(value !== undefined){
  // 开始渲染数据
}

这样可以避免在数据未获取到时就开始渲染导致的错误。\[3\]
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