identifier

问题 I am developing an iOS app which calls web-service for login and at that time i send login credentials to web server along with vendor identifier (identifierForVendor),to identify device uniquely for those credentials.So user can have only one device and one credential. I got identifierForVendor with NSString *uuid = [[UIDevice currentDevice] identifierForVendor].UUIDString This identifier will then store in database of web server and also in device database.Next time when user opens

问题 If I have a <div id=\'a\'> in Chrome then in javascript I can do a. stuff() (it\'s like as if a is a global variable). However this does not work with FireFox - I will need to use document.getElementById(\'a\') . What is the correct behaviour here? (according to W3 specs that is) Also I\'m interested in how will Chrome resolve the ambiguity if I have a div with id a yet have a global variable called a too in my script. Is the behavior going to be random and whacky? And how would an element

问题 I have a db table say, persons in Postgres handed down by another team that has a column name say, \"first_Name\" . Now am trying to use PG commander to query this table on this column-name. select * from persons where first_Name=\"xyz\"; And it just returns ERROR: column \"first_Name\" does not exist Not sure if I am doing something silly or is there a workaround to this problem that I am missing? 回答1: All identifiers (including column names) that are not double-quoted are folded to lower

问题 I want to pass a table name as a parameter in a Postgres function. I tried this code: CREATE OR REPLACE FUNCTION some_f(param character varying) RETURNS integer AS $$ BEGIN IF EXISTS (select * from quote_ident($1) where quote_ident($1).id=1) THEN return 1; END IF; return 0; END; $$ LANGUAGE plpgsql; select some_f(\'table_name\'); And I got this: ERROR: syntax error at or near \".\" LINE 4: ...elect * from quote_ident($1) where quote_ident($1).id=1)... ^ ********** Error ********** ERROR:

问题 Working on an idea for a simple HTMLElement wrapper I stumbled upon the following for Internet Explorer and Chrome: For a given HTMLElement with ID in the DOM tree, it is possible to retrieve the div using its ID as the variable name. So for a div like <div id=\"example\">some text</div> in Internet Explorer 8 and Chrome you can do: alert(example.innerHTML); //=> \'some text\' or alert(window[\'example\'].innerHTML); //=> \'some text\' So, does this mean every element in the DOM tree is