关于前端:flvjs-添加AbortController来终止fetch修复播放器在destroy后仍然会下载数据的问题

转载自github：https://github.com/bilibili/flv.js/pull/448/files
，
避免失落记录,要批改源码：

@@ -117,6 +117,12 @@ class FetchStreamLoader extends BaseLoader {params.referrerPolicy \= dataSource.referrerPolicy;}  // add abort controller, by wmlgl 2019-5-10 12:21:27if (self.AbortController) {this.\_abortController \= new self.AbortController();params.signal \= this.\_abortController.signal;}  this.\_status \= LoaderStatus.kConnecting;self.fetch(seekConfig.url, params).then((res) \=> {if (this.\_requestAbort) {[](https://github.com/bilibili/flv.js/pull/448/files#diff-2236408d6aad747aed1a901e3aac73fe "Expand Down")[](https://github.com/bilibili/flv.js/pull/448/files#diff-2236408d6aad747aed1a901e3aac73fe "Expand Up")@@ -152,6 +158,10 @@ class FetchStreamLoader extends BaseLoader {}}}).catch((e) \=> {if (this.\_abortController && this.\_abortController.signal.aborted) {return;}  this.\_status \= LoaderStatus.kError;if (this.\_onError) {this.\_onError(LoaderErrors.EXCEPTION, {code: \-1, msg: e.message});[](https://github.com/bilibili/flv.js/pull/448/files#diff-2236408d6aad747aed1a901e3aac73fe "Expand All")@@ -163,6 +173,10 @@ class FetchStreamLoader extends BaseLoader {  abort() {this.\_requestAbort \= true;  if (this.\_abortController) {this.\_abortController.abort();}}  \_pump(reader) { // ReadableStreamReader

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