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); });
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