演示案例：12306，
需求：點擊購票按鈕，頁面跳轉至購票頁面，點擊跳轉頁面“登錄”按鈕時，腳本報錯
package com.Demotest;
import org.openqa.jetty.html.List;
import org.openqa.selenium.By;
import org.openqa.selenium.WebElement;
import org.openqa.selenium.chrome.ChromeDriver;
public class Booking
{
public static void main(String[] args) throws InterruptedException
{
// TODO Auto-generated method stub
ChromeDriver driver = new ChromeDriver();
driver.manage().window().maximize();//將窗口最大化
driver.get("http://www.12306.cn");
//點擊購票按鈕
/*
List<WebElement> elements = driver.findElements(By.tagName("img"));
for (WebElement webElement : elements)
{
if (webElement.getAttribute("src").contains("http://www.12306.cn/mormhweb/images/ico_gp.gif"))
{
webElement.click();
Thread.sleep(1000);
break;
}
}
*/
//點擊購票
driver.findElement(By.cssSelector("img[alt=\"購票\"]")).click();
//窗口切換，獲取窗口句柄
String winHandleBefore = driver.getWindowHandle();
for(String winHandle : driver.getWindowHandles())
{
if (winHandle.equals(winHandleBefore))
{
continue;
}
driver.switchTo().window(winHandle);
break;
}
//點擊登錄按鈕
driver.findElement(By.id("login_user")).click();
}
}