Javascript 在控制台和回调消息中捕获错误

Question

我有这个功能，它是一个搜索查询。 这工作正常，除非查询字符串名称不够详细，然后抛出错误消息

request( url, function (error, data) {
errorText = arguments['0'];
  if (error) {
      callback('Unable to connect to location services!', undefined)
  } else if (errorText.includes('Cannot read property')) {
      callback ('Unable to find location, try another search.', undefined)
  } 
  else {
    callback( {
      data = data.body,
      namePlace: data.suggestions[1].entities[0].name,
      idPlace: data.suggestions[1].entities[0].destinationId,
      })
   } 
})  

来自控制台的错误消息是

namePlace: data.suggestions[1].entities[0].name,
                                           ^
TypeError: Cannot read property 'name' of undefined

我希望能够捕获此错误消息并回调“无法找到位置，请尝试其他搜索”。

Answer 1

听起来您要检查的是data.suggestions[1].entities是否有任何条目。 也许是这样的：

else if (data.suggestions[1].entities.length === 0) {
  callback('Unable to find location, try another search.', undefined)
}

根据结果​​数据结构的可靠性，您还可以检查null或undefined值。 但是对于这个特定的错误，它看起来像定义了entities和一个数组，但没有条目。

Answer 2

您需要更改第一个if的逻辑顺序，否则else if (error)将阻止if (errorText.includes('Cannot read property')) 。

您之前是否定义过let request = new Request(<uri>) ？

你想做什么？

request( url, function (error, data) {
errorText = arguments['0']; // What are you trying to do here?
  if (errorText.includes('Cannot read property')) {
      callback ('Unable to find location, try another search.', undefined)
  } else if (error) {
      callback('Unable to connect to location services!', undefined)
  } else {
    callback( {
      data = data.body, // What are you trying to do here?
      namePlace: data.suggestions[1].entities[0].name, // What are you trying to do here?
      idPlace: data.suggestions[1].entities[0].destinationId,
      })
   } 
}); // <- semicolon here