显式等待应有助于：

public static String waitForElementNotVisible(int timeOutInSeconds, WebDriver driver, String elementXPath) {
    if ((driver == null) || (elementXPath == null) || elementXPath.isEmpty()) {

        return "Wrong usage of WaitforElementNotVisible()";
    }
    try {
        (new WebDriverWait(driver, timeOutInSeconds)).until(ExpectedConditions.invisibilityOfElementLocated(By
                .xpath(elementXPath)));
        return null;
    } catch (TimeoutException e) {
        return "Build your own errormessage...";
    }
}