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當我嘗試在mongodb中查找最大id編號時,它不起作用。我錯過了什麼?在貓鼬查詢上未處理的「錯誤」事件
這裏是我的代碼:
router.get('/check', function(req, res, next) {
var query = news.find({}, {"id":1,"_id":0});
query.select('id');
query.exec(function (err, result) {
res.writeHead(200,{'Content-Type':'text/plain;charset=UTF-8'});
if(err) {
res.end(err);
};
res.end(result);
});
});
和這裏的錯誤:
events.js:160
throw er; // Unhandled 'error' event
^
TypeError: First argument must be a string or Buffer
at ServerResponse.OutgoingMessage.end (_http_outgoing.js:543:11)
at C:\Users\Romy\WebstormProjects\388-admin\routes\admin.js:44:13