获取 元素/节点/标签 的几点方法
getElementById
getElementsByTagName
getElementsByName
getByClass √ // 现在通过class 也可以查找节点
<html> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8"> <title>getByClasss</title> <script type="text/javascript"> function getByClass(oParent, aClass) { var aEle=oParent.getElementsByTagName('*'); var arr=[]; for(var i=0;i<aEle.length;i++) { if(aEle[i].className==aClass) { arr.push(aEle[i]); } } return arr; } window.onload=function() { var oUl=document.getElementById('ul1'); var aBox=getByClass(oUl, 'box'); for(var i=0;i<aBox.length;i++) { aBox[i].style.background="red"; } } </script> </head> <body> <ul id="ul1"> <li></li> <li class="box">a</li> <li></li> <li></li> <li class="box">a</li> <li></li> </ul> </body> </html>