源代码:
<!DOCTYPE html> <html> <head> <script src="http://libs.baidu.com/jquery/1.10.2/jquery.min.js"> </script> <script> $(document).ready(function(){ $("button").click(function(){ $("<span>Hello world!</span>").insertBefore("p"); }); }); </script> </head> <body> <button>Insert span element before each p element</button> <br><br> <p>This is a paragraph.</p> <p>This is another paragraph.</p> </body> </html>
运行结果：