javascript - 为什么 Meteor.users.findOne({username : "test"}) returns an object but replacing "test" with variable that has the same value returns undefined

Question

var usr = [];
var chatUsers = Session.get("newChatUser");
for ( i in chatUsers )
{
    var a = chatUsers[i];
    var id = Meteor.users.findOne({ username : a });
    usr.push({
        uid : id._id,
        name : a
    });
}

当 a 是“测试”但当我运行时，这里的 id 变为未定义

Meteor.users.findOne({ username : "test" })

在浏览器控制台中，它返回正确的对象。我的代码有什么问题？

Answer 1

尝试:

Meteor.users.findOne({ username: a.trim() })