Javascript在循环内推送元素，不会影响循环外的数组

Question

我有一个空数组，我希望将项目推送到循环内部。一旦在循环外，阵列将丢失所有信息

var result = [];
        users.find({}, {username: true, isOnline: true, uniq: true, _id: false}, function(err, cursor) {
            cursor.each(function(err, item) {
                result.push(item);
                console.log(result); //every iteration the array shows fine
            });

            console.log(result); //array is empty
        });

        console.log(result); //array is empty