js+加try+catch

try {
    // 尝试执行的代码
    let result = someFunctionThatMightThrowError();
} catch (error) {
    // 错误处理逻辑
    console.error("An error occurred:", error);
} finally {
    // 清理资源或执行其他必要操作
    console.log("Try...catch block finished.");
}

async function fetchData() {
    try {
        let response = await fetch('https://api.example.com/data');
        let data = await response.json();
    } catch (error) {
        console.error("Fetch error:", error);
    }
}

try {
    // 可能抛出错误的代码
} catch (error) {
    try {
        // 处理错误的代码，可能会再次抛出错误
    } catch (innerError) {
        console.error("Inner catch block error:", innerError);
    }
}