为空判断
服务器端的为空判断：ruby
class Stringdef blank?self.nil? || self.strip.empty?endend
网页前端的为空判断：js
function Check(){sel = document.yform.manual_action_title_select.value.replace(/\s/gi,"");input = document.yform.manual_action_title_input.value.replace(/\s/gi,"");if( sel == "" && input == "" ) {alert("value required!");return false;}return true;}