我是 node 和 javascript 的新手,并且一直在思考以下问题。我创建了一个对象,如下所示:
var Subscriber = {
'userID': String,
'email': String,
'name': String,
'stage': String,
'poster': Boolean,
'canEmail': Boolean,
'stage': String, }
我有一个查询 mongodb 的函数,并循环遍历结果,尝试加载订阅者数组,我已将其声明为:
var s = Subscriber;
var subscribers = [];
循环如下所示:
//load array of users that are subscribed to the group
async.forEach(g.subscribers, function(item, callback) {
//load user document for this user
User.findOne({ _id: item}, function(err, u) {
if(!err && u) {
//var s = new Subscriber();
console.log('Sub load, found user %s, building array item', u.email);
console.log('Subs @ loop start');
console.log(util.inspect(subscribers));
console.log('Heres foo: ' + util.inspect(foo));
s.userID = u._id;
s.email = u.email;
s.name = u.firstName + ' ' + u.lastName;
s.stage = u.stage;
s.poster = false; //we're just loading subscribers at this point'
if(s.stage != 'new') s.canEmail = true;
//push new subscriber onto the array
console.log('Pushing ' + util.inspect(s));
subscribers.push(s);
console.log('At end ' + util.inspect(subscribers));
foo.push(s.email);
console.log('Heres foo now: ' + util.inspect(foo));
callback(null, item);
}
每次调用subscribers.push(s) 后,数组都有正确数量的元素,但所有元素都匹配s 的最后一个值,如下所示(从数据库中提取两个不同的用户):
[ { userID: 4fc53a71163006ed0f000002,
email: 'test@test.com',
name: 'undefined undefined',
stage: 'new',
poster: false,
canEmail: true },
{ userID: 4fc53a71163006ed0f000002,
email: 'test@test.com',
name: 'undefined undefined',
stage: 'new',
poster: false,
canEmail: true } ]
推送 s 的单个元素而不是整个对象似乎没问题。我添加了“foo”数组作为测试,它工作正常:
Heres foo now: [ 'email1@foo.com', 'test@test.com' ]
这里发生了什么?!?!??!