首尾子节点:
有兼容性问题
firstChild、firstElementChild
lastChild、lastElementChild
兄弟节点:
有兼容性问题
nextSibling、nextElementSibling
previousSibling、previousElementSibling
例:
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en"> <head> <meta http-equiv="Content-Type" content="text/html;charset=UTF-8"> <title>Document</title> <script> window.onload=function(){ var oUl = document.getElementById('ul1'); //IE7 IE8 // oUl.firstChild.style.background='red'; //IE9+ FF chrome // oUl.firstElementChild.style.background='red'; //处理方法 var oFirst = oUl.firstElementChild||oUl.firstChild; oFirst.style.background='red'; } </script> </head> <body> <ul id="ul1"> <li></li> <li></li> <li></li> <li></li> <li></li> </ul> </body> </html>