@Test
    public void testDOM()throws Exception{
        Document doc = Jsoup.parse(new File("C:\\User\\tree\\Desktop\\test.html"), "utf8");
        // 1. 根据id查询元素getElementById
//        Element element = doc.getElementById("city_bj");
//        2. 根据标签获取元素 getElementByTag
//        Element element = doc.getElementsByTag("span");
        // 3. 根据class获取元素getElementsByCLass
//        Element element = doc.getElementsByClass("class_a").first();
//        4. 根据属性获取元素 getELementsByAttribute
//        Element element = doc.getElementsByAttributeValue("href","http://itcast.cn").first();
        Element element = doc.getElementsByAttribute("abc").first();

        System.out.println("获取到的元素内容是"+element.text());