react-native fetch引发空白问题

原创
2017/03/16 10:33
阅读数 1.4K

    近期发现部分机器 react-native一直loading问题,分析日志没有追踪到问题根源。

ReactNativeJS: Possible Unhandled Promise Rejection (id: 0):
                                                                      Network request failed

经过一番折腾才查到是 fetch没有回调

A fetch() promise will reject with a TypeError when a network error is encountered
, although this usually means permission issues or similar — a 404 does not 
constitute a network error, for example. An accurate check for a successful 
fetch() would include checking that the promise resolved, then checking that the 
Response.ok property has a value of true. The code would look something like this:

fetch('flowers.jpg')
.then(function(response) {
  if(response.ok) {
    return response.blob();
  }
  throw new Error('Network response was not ok.');
})
.then(function(myBlob) { 
  var objectURL = URL.createObjectURL(myBlob); 
  myImage.src = objectURL; 
})
.catch(function(error) {
  console.log('There has been a problem with your fetch operation: ' + error.message);
});

按照文章意思增加catch异常处理逻辑即可。

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