2
我有一个while循环匹配一个条件来过滤来自mongodb的数据。但是,当我使用回调时,我只收到console.log
的一个结果。如果我在while循环中使用console.log,我应该会收到三个条目。为什么只有一条数据使其回调?虽然循环和回调返回不同的结果
while(i--) {
if (0 >= [friday, saturday, sunday].indexOf(results[i].selectedDate)) {
theWeekend = results[i];
console.log(theWeekend); //returns three results (correct)
}
}
callback(err, theWeekend)
console.log(theWeekend); //returns one results (incorrect)
正确性
{ _id: 56fffb5ceb76276c8f39e3f3,
url: 'http://londonist.com/2015/11/where-to-eat-and-drink-in-balham',
title: 'Where To Eat And Drink In... Balham | Londonist',
selectedDate: Fri Apr 01 2016 01:00:00 GMT+0100 (BST),
__v: 0 }
{ _id: 56fffb8eeb76276c8f39e3f5,
url: 'https://news.ycombinator.com/item?id=11404770',
title: 'The Trouble with CloudFlare | Hacker News',
selectedDate: Sun Apr 03 2016 01:00:00 GMT+0100 (BST),
__v: 0 }
{ _id: 56fffb6ceb76276c8f39e3f4,
url: 'http://wellnessmama.com/13700/benefits-coconut-oil-pets/',
title: 'Benefits of Coconut Oil for Pets - Wellness Mama',
selectedDate: Sat Apr 02 2016 01:00:00 GMT+0100 (BST),
__v: 0 }
不正确的数据
{ _id: 56fffb6ceb76276c8f39e3f4,
url: 'http://wellnessmama.com/13700/benefits-coconut-oil-pets/',
title: 'Benefits of Coconut Oil for Pets - Wellness Mama',
selectedDate: Sat Apr 02 2016 01:00:00 GMT+0100 (BST),
__v: 0 }
['Array.prototype .filter()'](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/filter) – Andreas