//判断元素是否存在
public boolean IsElementPresent (WebElement webElement, By by) {
    boolean status = false;
    try {
        if (webElement == null) {
            driver.findElement(by);
            status = true;
        }else {
            webElement.findElement(by);
            status = true;
        }
    } catch (NoSuchElementException e) {
        status = false;
    }
    return status;
}

//判断标签是否存在
public boolean IsTagNamePresent (WebElement webElement, String tagName) {
    boolean status = false;
   if (!webElement.getAttribute(tagName).equals("")){
       status=true;
   }else {
       status=false;
   }
    return status;
}