zrdbm
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 <!DOCTYPE html> <html> <head> <title>访问元素</title> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <style> .mycolor{ color:#fff; } .steam{ color: red; } </style> </head> <body> <ul id="ul"> <li id="ali">油条</li><li id="bli">包子</li><li id="cli">米饺</li><li id="dli"><a id="yufen">鱼粉</a></li> </ul> <script> // 查找父节点 var tempel = document.getElementById("bli"); tempel.className="steam"; var previousNode = tempel.previousSibling; previousNode.className="mycolor"; var nextNode = tempel.nextSibling; nextNode.className="mycolor"; </script> </body> </html>兄弟元素查找比较坑，只是能元素在同一行时才能查询。
查询子节点 firstChild lastChild
zrdbm
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 <!DOCTYPE html> <html> <head> <title>访问元素</title> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <style> .mycolor{ color:#fff; } .steam{ color: red; } </style> </head> <body> <ul id="ul" ><li id="ali">油条</li ><li id="bli">包子</li ><li id="cli"><a id="yufen">米饺</a></li ><li id="dli">鱼粉</li ></ul> <script> // 查找子节点 var tempel = document.getElementById("ul"); var firstNode = tempel.firstChild; firstNode.className = "mycolor"; var lastNode = tempel.lastChild; lastNode.className = "mycolor"; </script> </body> </html>注意，<ul></ul>这段代码，要写成这样才正常查询到。