response.set( 'content-type', mimeType );//设置返回类型 var stream = fs.createReadStream( imageFilePath ); var responseData = [];//存储文件流 if (stream) {//判断状态 stream.on( 'data', function( chunk ) { responseData.push( chunk ); }); stream.on( 'end', function() { var finalData = Buffer.concat( responseData ); response.write( finalData ); response.end(); }); }