小旋风SEO教程 TIY
编辑您的代码：
<html><head><script type="text/javascript" src="/w3c/jquery/jquery.js"></script><script type="text/javascript"> $(document).ready(function(){ $("button").click(function(){ $('p').addClass(function(n){ return 'par_' + n; }); }); }); </script><style type="text/css"> .par_0 { color:blue; } .par_1 { color:red; } </style><link rel="canonical" href="https://www.xxfseo.com/w3c/tiy/t.asp-f=jquery_attributes_addclass_func.html" /></head><body><h1>This is a heading</h1><p>This is a paragraph.</p><p>This is another paragraph.</p><button>向 p 元素添加类</button></body></html>
查看结果: