收到错误"TypeError: Cannot read property 'channel‘of undefined“

let myObject = { channel: 'exampleChannel' };
console.log(myObject.channel); // 正常工作

if (myObject && myObject.channel) {
    console.log(myObject.channel);
} else {
    console.log('myObject is undefined or does not have a channel property');
}

async function fetchData() {
    try {
        let response = await fetch('https://api.example.com/data');
        let data = await response.json();
        if (data && data.channel) {
            console.log(data.channel);
        } else {
            console.log('Data does not contain a channel property');
        }
    } catch (error) {
        console.error('Error fetching data:', error);
    }
}

fetchData();

let channel = myObject?.channel;
console.log(channel); // 如果myObject是undefined或null，这里会是undefined而不是抛出错误