大家好，请给我看看代码。当我按开始时我想在txtfield中看到随机，当按下它时它会记录随机名称。
----------------------------------------------------------------------
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KeyError Traceback (most recent call
last)
<ipython-input-22-1c9d47341338> in <module>()
----> 1 server_status_result = db.command('serverStatus')
2 pprint(server_status_result)
/home/tim/.virtualenvs/main/lib/python3.6/site-
packages/pymongo/database.py in command(self, command, value, check,
allowable_errors, read_preference, codec_options, **kwargs)
489 """
490 client = self.__client
--> 491 with client._socket_for_reads(read_preference) as
(sock_info, slave_ok):
492 return self._command(sock_info, command, slave_ok,
value,
493 check, allowable_errors,
read_preference,
/usr/lib/python3.6/contextlib.py in __enter__(self)
80 def __enter__(self):
81 try:
---> 82 return next(self.gen)
83 except StopIteration:
84 raise RuntimeError("generator didn't yield") from None
/home/tim/.virtualenvs/main/lib/python3.6/site-
packages/pymongo/mongo_client.py in _socket_for_reads(self,
read_preference)
857 topology = self._get_topology()
858 single = topology.description.topology_type ==
TOPOLOGY_TYPE.Single
--> 859 with self._get_socket(read_preference) as sock_info:
860 slave_ok = (single and not sock_info.is_mongos) or (
861 preference != ReadPreference.PRIMARY)
/usr/lib/python3.6/contextlib.py in __enter__(self)
80 def __enter__(self):
81 try:
---> 82 return next(self.gen)
83 except StopIteration:
84 raise RuntimeError("generator didn't yield") from None
/home/tim/.virtualenvs/main/lib/python3.6/site-
packages/pymongo/mongo_client.py in _get_socket(self, selector)
823 server = self._get_topology().select_server(selector)
824 try:
--> 825 with server.get_socket(self.__all_credentials) as
sock_info:
826 yield sock_info
827 except NetworkTimeout:
/usr/lib/python3.6/contextlib.py in __enter__(self)
80 def __enter__(self):
81 try:
---> 82 return next(self.gen)
83 except StopIteration:
84 raise RuntimeError("generator didn't yield") from None
/home/tim/.virtualenvs/main/lib/python3.6/site-
packages/pymongo/server.py in get_socket(self, all_credentials,
checkout)
166 @contextlib.contextmanager
167 def get_socket(self, all_credentials, checkout=False):
--> 168 with self.pool.get_socket(all_credentials, checkout)
as sock_info:
169 yield sock_info
170
/usr/lib/python3.6/contextlib.py in __enter__(self)
80 def __enter__(self):
81 try:
---> 82 return next(self.gen)
83 except StopIteration:
84 raise RuntimeError("generator didn't yield") from None
/home/tim/.virtualenvs/main/lib/python3.6/site-
packages/pymongo/pool.py in get_socket(self, all_credentials,
checkout)
790 sock_info = self._get_socket_no_auth()
791 try:
--> 792 sock_info.check_auth(all_credentials)
793 yield sock_info
794 except:
/home/tim/.virtualenvs/main/lib/python3.6/site-
packages/pymongo/pool.py in check_auth(self, all_credentials)
510
511 for credentials in cached - authset:
--> 512 auth.authenticate(credentials, self)
513 self.authset.add(credentials)
514
/home/tim/.virtualenvs/main/lib/python3.6/site-
packages/pymongo/auth.py in authenticate(credentials, sock_info)
468 mechanism = credentials.mechanism
469 auth_func = _AUTH_MAP.get(mechanism)
--> 470 auth_func(credentials, sock_info)
471
472
/home/tim/.virtualenvs/main/lib/python3.6/site-
packages/pymongo/auth.py in _authenticate_default(credentials,
sock_info)
448 def _authenticate_default(credentials, sock_info):
449 if sock_info.max_wire_version >= 3:
--> 450 return _authenticate_scram_sha1(credentials,
sock_info)
451 else:
452 return _authenticate_mongo_cr(credentials, sock_info)
/home/tim/.virtualenvs/main/lib/python3.6/site-
packages/pymongo/auth.py in _authenticate_scram_sha1(credentials,
sock_info)
227 ('conversationId', res['conversationId']),
228 ('payload', Binary(client_final))])
--> 229 res = sock_info.command(source, cmd)
230
231 parsed = _parse_scram_response(res['payload'])
/home/tim/.virtualenvs/main/lib/python3.6/site-
packages/pymongo/pool.py in command(self, dbname, spec, slave_ok,
read_preference, codec_options, check, allowable_errors, check_keys,
read_concern, write_concern, parse_write_concern_error, collation)
422 # Catch socket.error, KeyboardInterrupt, etc. and close
ourselves.
423 except BaseException as error:
--> 424 self._raise_connection_failure(error)
425
426 def send_message(self, message, max_doc_size):
/home/tim/.virtualenvs/main/lib/python3.6/site-
packages/pymongo/pool.py in _raise_connection_failure(self, error)
550 _raise_connection_failure(self.address, error)
551 else:
--> 552 raise error
553
554 def __eq__(self, other):
/home/tim/.virtualenvs/main/lib/python3.6/site-
packages/pymongo/pool.py in command(self, dbname, spec, slave_ok,
read_preference, codec_options, check, allowable_errors, check_keys,
read_concern, write_concern, parse_write_concern_error, collation)
417 read_concern,
418
parse_write_concern_error=parse_write_concern_error,
--> 419 collation=collation)
420 except OperationFailure:
421 raise
/home/tim/.virtualenvs/main/lib/python3.6/site-p
ackages/pymongo/network.py in command(sock, dbname, spec, slave_ok,
is_mongos, read_preference, codec_options, check, allowable_errors,
address, check_keys, listeners, max_bson_size, read_concern,
parse_write_concern_error, collation)
108 response = receive_message(sock, 1, request_id)
109 unpacked = helpers._unpack_response(
--> 110 response, codec_options=codec_options)
111
112 response_doc = unpacked['data'][0]
/home/tim/.virtualenvs/main/lib/python3.6/site-
packages/pymongo/helpers.py in _unpack_response(response, cursor_id,
codec_options)
126 # Fake the ok field if it doesn't exist.
127 error_object.setdefault("ok", 0)
--> 128 if error_object["$err"].startswith("not master"):
129 raise NotMasterError(error_object["$err"],
error_object)
130 elif error_object.get("code") == 50:
KeyError: '$err'
function startRandomly() {
choices = document.getElementById("choicelist").value.split("\n");
if (choices.length == 0) return;
//document.getElementById("result").value = choices[Math.floor(Math.random() * choices.length)];
document.getElementById("result").value = choices[Math.floor(Math.random() * choices.length)];
}
答案 0 :(得分：3)
使用setInterval和clearInterval在setInterval内，您可以在0和数组长度之间生成随机数。
var interval = null;
var randomValue = null;
var choices = [];
function startRandomly() {
choices = document.getElementById("choicelist").value.trim().split("\n").filter(Boolean);
if (choices.length == 0) return;
if (choices.length == 1) {
randomValue = 0;
stopRandomly();
return;
}
interval = setInterval(function () {
randomValue = getRandomInt(0, choices.length - 1);
document.getElementById("random").innerHTML = choices[randomValue];
}, 1);
}
function stopRandomly() {
clearInterval(interval);
if (choices.length && randomValue >= 0) {
document.getElementById("result").value = choices[randomValue];
}
}
function getRandomInt(min, max) {
return Math.floor(Math.random() * (max - min + 1)) + min;
}<form action="" onSubmit="return false;">
<textarea id="choicelist" rows="10" cols="20" placeholder="Pls input name here..."></textarea>
<input value="Start" onClick="startRandomly(); return false;" type="button">
<input value="Stop" onClick="stopRandomly()" type="button">
<p>Current: <span id="random"></span></p>
<p>Congratulation: </p><input id="result" size="50" value="" readonly type="text">
</form>