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@@ -0,0 +1,70 @@
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+<!DOCTYPE html>
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+<html lang="en">
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+
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+<head>
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+ <meta charset="UTF-8">
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+ <meta http-equiv="X-UA-Compatible" content="IE=edge">
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+ <meta name="viewport" content="width=device-width, initial-scale=1.0">
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+ <title>Document</title>
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+</head>
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+
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+<body>
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+ <div id="div1">1111111</div>
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+ <p id="p1">2222222222</p>
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+ <ul id="ul1">
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+ <li id="li1">1</li>
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+ <li>2</li>
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+ <li>3</li>
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+ </ul>
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+
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+ <script>
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+ var div1 = document.getElementById('div1')
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+ var p1 = document.getElementById('p1')
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+ var li1 = document.getElementById('li1')
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+ var ul1 = document.getElementById('ul1')
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+ // console.log(div1)
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+ // console.log(div1.nodeType)
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+ // console.log(div1.nextSibling)
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+ // console.log(div1.previousSibling)
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+ //nextSibling 指向下一个兄弟节点
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+ //previousSibling 指向上一个兄弟节点
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+ /*
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+ 元素节点的 nodeName 与标签名相同
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+ 属性节点的 nodeName 与属性名相同
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+ 文本节点的 nodeName 始终是 #text
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+ 文档节点的 nodeName 始终是 #document
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+ */
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+ // console.log(div1.nodeName)
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+ // console.log(p1.nodeName)
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+ // console.log(li1)
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+ //nextElementSibling 下一个元素节点
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+ // console.log(li1.nextElementSibling)
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+ // console.log(li1.previousElementSibling)
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+
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+ console.log(li1.nodeName)
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+ function next(elem){
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+ do{
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+ elem = elem.nextSibling
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+ } while(elem.nodeType != 1)
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+ return elem
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+ }
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+ console.log(next(p1))
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+
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+
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+ console.log(ul1.firstChild)
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+ console.log(ul1.lastChild)
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+ console.log(ul1.firstElementChild)
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+
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+ //elem.nodeName == 'LI'
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+ function first(elem){
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+ elem = elem.firstChild
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+ if(elem.nodeType != 1 ){
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+ elem = next(elem)
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+ }
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+ return elem
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+ }
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+ console.log(first(ul1))
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+ </script>
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+</body>
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+
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+</html>
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zsydgithub