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1.用setAttribute()方法
<!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"> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <title>无标题文档</title> <style> .pp { color:red; } </style> </head> <body> <p id="demo">This </p> <script> var p = document.getElementById("demo"); p.setAttribute("class","pp"); </script> </body> </html>
2.setAttributeNode方法
<!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"> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <title>无标题文档</title> <style> .pp { color:red; } </style> </head> <body> <p id="demo">This </p> <script> var p = document.getElementById("demo"); var att = document.createAttribute("class"); att.value = "pp"; p.setAttributeNode(att); </script> </body> </html>
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原文地址：http://www.cnblogs.com/pmx-pmx/p/4826350.html
