这里是我在meanstack中使用的代码,用于获取有限数据
apiRouter.get('/pagination_posts', function(req, res){
console.log(req.params) // getting object having value for limit and offset
Post.count({},function(err,count){
console.log(count) // total number of records
Post.find({}, function(err, posts){
if (err) res.send(err);
res.json({total:count,posts:posts});
}).skip(req.query.offset).limit(req.query.limit);
});
});
遇到以下错误:
events.js:160
throw er; // Unhandled 'error' event
^
Error: Can't set headers after they are sent.
at ServerResponse.OutgoingMessage.setHeader (_http_outgoing.js:356:11)
at ServerResponse.header (/Volumes/E/simerjit/fwrkdeploy/node_modules/express/lib/response.js:718:10)
at ServerResponse.send (/Volumes/E/simerjit/fwrkdeploy/node_modules/express/lib/response.js:163:12)
at ServerResponse.json (/Volumes/E/simerjit/fwrkdeploy/node_modules/express/lib/response.js:249:15)
at /Volumes/E/simerjit/fwrkdeploy/server/api/posts.js:29:9
at /Volumes/E/simerjit/fwrkdeploy/node_modules/mongoose/lib/model.js:3822:16
at /Volumes/E/simerjit/fwrkdeploy/node_modules/kareem/index.js:213:48
at /Volumes/E/simerjit/fwrkdeploy/node_modules/kareem/index.js:131:16
at _combinedTickCallback (internal/process/next_tick.js:73:7)
at process._tickCallback (internal/process/next_tick.js:104:9)
如果我在这里使用静态值}).skip(0).limit(10);
,它可以正常工作,但是我想将此 API 用于分页,因此需要传递动态限制和偏移量。