创建 css 表达式有哪些不同的方法？

import org.openqa.selenium.By;import org.openqa.selenium.Keys;import org.openqa.selenium.WebDriver;import org.openqa.selenium.WebElement;import org.openqa.selenium.chrome.ChromeDriver;import java.util.concurrent.TimeUnit;public class CssExpression {   public static void main(String[] args) {      System.setProperty("webdriver.chrome.driver", "C:\Users\ghs6kor\Desktop\Java\chromedriver.exe");      WebDriver driver = new ChromeDriver();      String url = "https://www.tutorialspoint.com/index.htm";      driver.get(url);      driver.manage().timeouts().implicitlyWait(12, TimeUnit.SECONDS);      //Using class with . For css expression      driver.findElement(By.cssSelector(".gsc- input")).sendKeys("Selenium");      driver.close();      }}

import org.openqa.selenium.By;import org.openqa.selenium.Keys;import org.openqa.selenium.WebDriver;import org.openqa.selenium.WebElement;import org.openqa.selenium.chrome.ChromeDriver;import java.util.concurrent.TimeUnit;public class CssId {   public static void main(String[] args) {      System.setProperty("webdriver.chrome.driver",    "C:\Users\ghs6kor\Desktop\Java\chromedriver.exe");      WebDriver driver = new ChromeDriver();      String url = "https://www.tutorialspoint.com/index.htm";      driver.get(url);      driver.manage().timeouts().implicitlyWait(12, TimeUnit.SECONDS);      //Using id with # for css expression      driver.findElement(By.cssSelector("#gsc-i- id1")).sendKeys("Selenium");      driver.close();   }}

import org.openqa.selenium.By;import org.openqa.selenium.Keys;import org.openqa.selenium.WebDriver;import org.openqa.selenium.WebElement;import org.openqa.selenium.chrome.ChromeDriver;import java.util.concurrent.TimeUnit;public class CssTagExp {   public static void main(String[] args) {      System.setProperty("webdriver.chrome.driver", "C:\Users\ghs6kor\Desktop\Java\chromedriver.exe");      WebDriver driver = new ChromeDriver();      String url = "https://www.tutorialspoint.com/index.htm";      driver.get(url);      driver.manage().timeouts().implicitlyWait(12, TimeUnit.SECONDS);      //Using id tagname attribute combination for css expression      driver.findElement(By.cssSelector("input[name=’search’]")).      sendKeys("Selenium");      driver.close();   }}