Jquery length of attribute undefined

问题

How can I check the lenght of the string that is in the attribute?This shows 'undefined' value:

var action = $(obj).closest("form").attr('action');
alert(action.lenght);

回答1:

Your spelling is just a bit off, .lenght should be .length:

var action = $(obj).closest("form").attr('action');
alert(action.length);

回答2:

Always goto api when some method is not found before you make a post somewhere.

http://api.jquery.com

http://api.jquery.com/length/

来源：https://stackoverflow.com/questions/4376276/jquery-length-of-attribute-undefined