用来删除由.attr() | .prop()方法设置的属性集:
随着一些内置属性的DOM元素或window对象，如果试图将删除该属性，浏览器可能会产生错误。jQuery第一次分配undefined值的属性，而忽略了浏览器生成的任何错误
实例:
<!DOCTYPE html> <html lang='zh-cn'> <head> <title>Insert you title</title> <meta http-equiv='description' content='this is my page'> <meta http-equiv='keywords' content='keyword1,keyword2,keyword3'> <meta http-equiv="Content-Type" content="text/html; charset=utf-8"> <!-- <script type='text/javascript' src='./js/jquery-3.0.0.js'></script> --> <script type='text/javascript' src='./js/jquery-1.12.1.min.js'></script> <style type='text/css'> input{font:400 13px/20px 'Courier New';color:#000;} </style> <script type='text/javascript'> $(function(){ $('user').prop('autocomplete','on'); $('#user').removeProp('autocomplete'); $('#user').attr('style','background:#EEE;outline:none'); $('#user').removeAttr('style'); }); </script> </head> <body> <input type='text' id='user' required="required"/> </body> </html>