[JavaScrip]判斷字串是否為空白或包含某字元

判斷是否為空白字元
$('[name*=polFormatid]').val().trim() == ""
http://stackoverflow.com/questions/1151032/javascript-blank-space-validation


判斷是否包含某字元
$('[name*=polFormatid]').val().indexOf("%") != -1
http://stackoverflow.com/questions/1789945/method-like-string-contains-in-javascript http://miisoo.blogspot.tw/2008/01/javascript-string-operations.html