我有以下幾點(diǎn)：const [channelAndReadsArray, setChannelAndReadsArray] = useState()var channelAndReads = []const requests = channels.map((currentChannel) => {    axios.get(serverRestAddress...                        .then((result) => {        var element = {}        element.channel = currentChannel;        element.reads = result;        channelAndReads.push(element);    })                    })Promise.all(requests).then(() => {    setChannelAndReadsArray(channelAndReads)});            ...if (!channelAndReadsArray) {    return null})channelAndReadsArray.map((channelAndReads) => {    console.log(channelAndReads)})這在控制臺(tái)日志中給了我空值。我不確定這里有什么問(wèn)題