index.html
<!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>表单选择器</title> <script type="text/javascript" src="jquery.js"></script> <script type="text/javascript" src="demo.js"></script> <link type="text/css" rel="stylesheet" href="style.css" /> </head> <body> <form> <input type="hidden" name="id" value="123" /> <input type="text" disabled="disabled" name="user" value="123" /> <input type="password" name="pass" value="456" /> <textarea></textarea> <select name="city"> <!--option value="123">123</option--> <option>1</option> <option>2</option> <option>3</option> </select> <button></button> <input type="radio" name="sex" value="男" checked="checked" />男 <input type="radio" name="sex" value="女" />女 </form> </body> </html>
demo.js
$(function(){ //alert($('input').size()); //alert($('input').val()); //alert($('input').eq(1).val()); //这种写法语义不清晰 //alert($('input[type=password]').val()); //语义清晰一点 //alert($('input[name=user]').val());//推荐 //alert($('input[type=password][name=pass]').val()); //alert($('input').size()); //alert($(':input').size()); //alert($(':input[name=city]').val()); //alert($(':text').size()); //alert($(':password').size()); //alert($(':radio').size()); //alert($(':radio[name=sex]').eq(1).size()); //alert($(':radio[name=sex]').last().size()); //alert($('form :hidden').size()); //alert($('form :enabled').size()); //alert($('form :disabled').size()); //alert($('form :checked').size()); //alert($('form :selected').get(0)); alert($('form :selected').size()); });