Question

我想确保在类外更改对象的属性时引发错误。这是我尝试执行的操作：

class Example {
  constructor(index) {
    this.index = index;

    Object.defineProperty(this, 'index', {
      set() {
        throw new AssertionError("can't set attribute");
      }
    });
  }
}

class AssertionError extends Error {
  constructor(message) {
    super();
    this.name = "AssertionError";
    this.message = message;
  }
}


let example = new Example(5);
console.log(example.index); //prints undefined instead of 5
example.index = 10; // I want to throw an AssertionError here

就像我想要的那样抛出错误，但是索引值未定义。我仍然希望能够在类内部更改属性，但是我想防止属性在类外部更改。

Answer 1

您可以通过调用public class flyYatra { public void mainTest() throws IOException, InterruptedException, WebDriverException, SocketException { System.setProperty("webdriver.chrome.driver", "C:\\Users\\Downloads\\Driver\\chromedriver.exe"); ChromeOptions options = new ChromeOptions(); options.addArguments("--incognito"); DesiredCapabilities capabilities = DesiredCapabilities.chrome(); capabilities.setCapability(ChromeOptions.CAPABILITY, options); WebDriver driver = new ChromeDriver(capabilities); driver.manage().timeouts().implicitlyWait(5, TimeUnit.SECONDS);重新定义属性。您应该给它吸气剂：

defineProperty

任何给定的属性名称只能使用一次；属性必须是普通属性或具有getter / setter函数的属性。

属性更改时如何引发错误？

1 个答案: