尝试使用fluentwait而不是Thread.sleep().您的元素可能没有在10秒内加载完毕，您可以尝试

Try using fluentwait instead of Thread.sleep(). Your element might not have been loaded in 10 seconds you may try this

// Waiting 30 seconds for an element to be present on the page, checking
 // for its presence once every 5 seconds.
   Wait<WebDriver> wait = new FluentWait<WebDriver>(driver)
   .withTimeout(30, SECONDS)
   .pollingEvery(5, SECONDS)
   .ignoring(NoSuchElementException.class);

WebElement foo = wait.until(new Function<WebDriver, WebElement>() {
 public WebElement apply(WebDriver driver) {
   return driver.findElement(By.id("foo"));
 }
}); 

这里.