未定义Javascript数组或索引

let myArray = [1, 2, 3];
console.log(myArray[0]); // 正确输出 1

let myArray = [1, 2, 3];
if (myArray.length > 1) {
    console.log(myArray[1]); // 安全访问索引 1
}

async function fetchData() {
    let response = await fetch('https://api.example.com/data');
    let data = await response.json();
    if (data && Array.isArray(data)) {
        console.log(data[0]); // 确保数据是数组后再访问
    }
}

function getElementSafely(array, index) {
    if (!Array.isArray(array)) {
        console.error('Provided value is not an array.');
        return undefined;
    }
    if (index >= 0 && index < array.length) {
        return array[index];
    } else {
        console.error('Index out of bounds.');
        return undefined;
    }
}

let myArray = [10, 20, 30];
console.log(getElementSafely(myArray, 1)); // 输出 20
console.log(getElementSafely(myArray, 3)); // 输出错误信息并返回 undefined