在查詢元素過程中，直接通過id或者xpath等找不到元素，檢視頁面原始碼發現元素是屬於iframe裡，例如：

<div class="wrap_login">
    <iframe class="frame_login" src="https://exaccount.eastmoney.com/home/login?request=%7b%22agentPageUrl%22%3a%22https%3a%2f%2fpassport.eastmoney.com%2fpub%2fLoginAgent%22%2c%22redirectUrl%22%3a%22http%3a%2f%2fwww.eastmoney.com%2f%22%2c%22callBack%22%3a%22LoginCallBack%22%2c%22redirectFunc%22%3a%22PageRedirect%22%2c%22data%22%3a%7b%22domainName%22%3a%22passport.eastmoney.com%22%2c%22deviceType%22%3a%22Web%22%2c%22productType%22%3a%22UserPassport%22%2c%22versionId%22%3a%220.0.1%22%7d%7d">
    </iframe>
</div>
 

以下為了定位到iframe裡面元素，有2種方法：

方法一：單獨開啟iframe網址，直接定位。

  @Test
public void loginTest() throws InterruptedException {

    System.setProperty("webdriver.firefox.bin", "D:\\Program Files\\Mozilla Firefox\\firefox.exe");
    WebDriver driver = new FirefoxDriver();
    driver.get("https://exaccount.eastmoney.com/home/login?request=%7b%22agentPageUrl%22%3a%22https%3a%2f%2fpassport.eastmoney.com%2fpub%2fLoginAgent%22%2c%22redirectUrl%22%3a%22http%3a%2f%2fwww.eastmoney.com%2f%22%2c%22callBack%22%3a%22LoginCallBack%22%2c%22redirectFunc%22%3a%22PageRedirect%22%2c%22data%22%3a%7b%22domainName%22%3a%22passport.eastmoney.com%22%2c%22deviceType%22%3a%22Web%22%2c%22productType%22%3a%22UserPassport%22%2c%22versionId%22%3a%220.0.1%22%7d%7d");  
    driver.manage().window().maximize();
    Thread.sleep(3000);   
    driver.findElement(By.id("txt_account")).sendKeys("ycyzharry");
    driver.findElement(By.id("txt_pwd")).sendKeys("password");
    driver.findElement(By.id("btn_login")).click();
}
 

方法二：先切換到iframe，再進行定位。

@Test
public void clickButtonTest() throws InterruptedException {
    System.setProperty("webdriver.firefox.bin", "D:\\Program Files\\Mozilla Firefox\\firefox.exe");
    WebDriver driver = new FirefoxDriver();
    driver.get("https://passport.eastmoney.com/pub/login?backurl=http%3A//www.eastmoney.com/");
    driver.manage().window().maximize();
    Thread.sleep(3000);

    WebElement iframe = driver.findElement(By.className("frame_login"));
    driver.switchTo().frame(iframe);
    driver.findElement(By.id("txt_account")).sendKeys("ycyzharry");
    driver.findElement(By.id("txt_pwd")).sendKeys("password");
    driver.findElement(By.id("btn_login")).click();
}
 

值得注意的是，如果iframe有id時，切換iframe時把id作為引數直接傳入

driver.switchTo().frame("id");

以上示例中，iframe沒有id，只有class="frame_login"，所以我們需要先通過classname定位到iframe元素，再把該元素作為引數傳入。

例如，如果要跳出iframe，可以使用以下方法：

driver.switchTo().defaultContent();

原文路徑：https://www.cnblogs.com/ycyzharry/p/7218429.html