java - Selenium 问题 - 弹出窗口

Question

有时弹出窗口有时不出现时如何设置条件。

Answer 1

    try{  
        WebDriverWait wait = new WebDriverWait(driver, 5);
        wait.until(ExpectedConditions.alertIsPresent());
        System.out.println(driver.switchTo().alert().getText());
        driver.switchTo().alert();  
    }     
    catch (NoAlertPresentException Ex)  
    {
        System.out.println("No alert");
    }