js中if条件里能使用try catch吗

let someVariable; // 假设这个变量可能未定义

if (true) { // 总是执行 try...catch 块，这里只是为了演示
  try {
    if (someVariable.length > 0) { // 如果 someVariable 未定义，会抛出错误
      console.log("Variable is defined and has length:", someVariable.length);
    } else {
      console.log("Variable is defined but empty.");
    }
  } catch (error) {
    console.error("An error occurred:", error.message);
    // 在这里处理错误，例如提供默认值或执行其他操作
    console.log("Continuing execution...");
  }
}

console.log("This line will still execute.");

function fetchData(url) {
  return new Promise((resolve, reject) => {
    // 模拟异步请求
    setTimeout(() => {
      const success = Math.random() > 0.5; // 模拟请求成功或失败
      if (success) {
        resolve({ data: "Data fetched successfully!" });
      } else {
        reject(new Error("Failed to fetch data."));
      }
    }, 500);
  });
}

async function processData() {
  try {
    const response = await fetchData("https://example.com/api/data");

    if (response && response.data) {
      console.log("Data processing:", response.data);
    } else {
      console.log("No data to process.");
    }
  } catch (error) {
    console.error("Error during data fetching:", error.message);
    // 可以选择提供默认数据或执行其他错误处理逻辑
    console.log("Using default data...");
    // 这里可以设置默认数据，以便程序继续运行
    const defaultData = { data: "Default data" };
    console.log("Data processing:", defaultData.data);
  } finally {
    console.log("Data processing completed (with or without errors).");
  }
}

processData();

if (myObject && myObject.hasOwnProperty('myProperty')) {
  // 安全地访问 myProperty
  console.log(myObject.myProperty);
} else {
  // 处理属性不存在的情况
  console.log("Property does not exist.");
}

try {
  // 可能会抛出错误的代码
  undefinedVariable.length; // 故意抛出一个 ReferenceError
} catch (error) {
  console.error("Error name:", error.name);
  console.error("Error message:", error.message);
  console.error("Error stack:", error.stack);
}