lovecoding
/
web0331


			
				
					
						
						
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							<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Document</title>
  </head>
  <body>
    <p id="main">这是一个p标签</p>
    <div id="box">这是一个盒子</div>
    <h1>你好</h1>
    <br />
    <h3>我好</h3>
    <hr />
    <div class="demo">
      <ul class="aa">
        <li>2222</li>
        <li>444</li>
      </ul>
    </div>
    <ol id="list">
      <li>ooo</li>
      <li>ooo</li>
      <li>ooo</li>
      <li>ooo</li>
      <li>ooo</li>
    </ol>
    <script>
      var main = document.getElementById("main");
      var box = document.getElementById("box");
      var h1 = document.querySelector("h1");
      var h3 = document.querySelector("h3");
      var ul = document.querySelector(".aa");
      var list = document.querySelector("#list");
      console.log(ul.nextElementSibling); //下一个元素节点
      console.log(main.previousElementSibling); //上一个元素节点
      console.log(ul.firstElementChild); //第一个子元素
      console.log(ul.lastElementChild.nodeType); //最后一个子元素
      console.log(ul.lastChild.nodeType);
      console.log(ul.firstChild);
      console.log(ul.firstChild.nextElementSibling.nextSibling.nextSibling);
      console.log(ul.nodeType);
      console.log(ul.innerHTML);
      console.log(ul.innerText);
      console.log(list.parentNode);
      console.log(list.children);
      console.log(list.childNodes);
      // parentNode 父节点
    //  children 子元素
    // childNodes 子节点
      // nextSibling 下一个兄弟节点
      // prevSibling 上一个兄弟节点
    </script>
  </body>
</html>