.//*[text()= '出发']/following-sibling::input"

//div[@id='js_flighttype_tab_domestic']//input[@name='fromCity']

 /**

 * @author Hjianhui

 * 12306  2016-08-05

 *

 */

 public class test{

     public static void main(String[] args) {

         WebDriver driver = new FirefoxDriver();

         try{

             driver.get("http://www.qunar.com/");

             driver.manage().window().maximize();

             //输入出发地方

             driver.findElement(By.xpath(".//*[text()= '出发']/following-sibling::input")).clear();

             driver.findElement(By.xpath(".//*[text()= '出发']/following-sibling::input")).sendKeys("北京");

             ////输入到达地方

             driver.findElement(By.xpath(".//*[text()= '到达']/following-sibling::input")).clear();

             driver.findElement(By.xpath(".//*[text()= '到达']/following-sibling::input")).sendKeys("广州");

             if(isElementPresent(driver, By.xpath(".//*[@id='closeXI20']")))

                 driver.findElement(By.xpath(".//*[@id='closeXI20']")).click();    

             driver.findElement(By.id("js_domestic_fromdate")).clear();

             driver.findElement(By.id("js_domestic_fromdate")).sendKeys("2016-08-20");

             //点击立即搜索

             driver.findElement(By.xpath(".//span[@class = 'p_btn']/button")).click();

         }catch (Exception e){

             e.printStackTrace();

         }

         driver.quit();

     }

     public static boolean isElementPresent(WebDriver driver, By by) {

             try {

               driver.manage().timeouts().implicitlyWait(1, TimeUnit.SECONDS);

               driver.findElement(by);

               return true;

             } catch (NoSuchElementException e) {

               return false;

             }

           }

 }