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request(url).pipe(fs.createWriteStream(fpath));
var bu = fs.createReadStream(fpath, {start: 0, end: 262});
dlog(bu);
我先写入文件,再读取里面的东西,但是createReadStream读取不到东西。这是为什么?是因为上面的操作是异步进行的吗?如果是,那应该如何获取呢?
PHP中文网2017-04-17 14:30:37
stream
是异步操作,你这种同步写法是得不到结果的,这么来:
request(url)
.pipe(fs.createWriteStream(fpath))
.on('close', function() {
var bu = fs.createReadStream(fpath, {start: 0, end: 262});
bu.on('data', function(chunk) {
console.log(chunk.toString());//这是结果
});
});
多看文档:fs