methods

问题 Is there some way to add methods to jQuery's objects? For example, I have jQuery object a = $('div') I'd like that every object which was assigned like that, would have particular method ( doSomething() ) so I could invoke it like a = $('.foo') a.doSomething() b = $('.bar') b.doSomething() 回答1: You have to add your function to the $.fn namespace. Please note that inside the function, this will refer to the jQuery object, not a DOM object. $.fn.doSomething = function () { this.css('color',

问题 I have a method that is called when an exception occurs: public void ErrorDBConcurrency(DBConcurrencyException e) { MessageBox.Show("You must refresh the datasource"); } What i would like to do is pass this function a method so if the user clicks Yes then the method is called e.g. public void ErrorDBConcurrency(DBConcurrencyException e, something Method) { if (MessageBox.Show("You must refresh the datasource") == DialogResult.OK) Method(); } The Method may or may not have parameters, if this

问题 What does the to_sym method do? What is it used for? 回答1: to_sym converts a string to a symbol. For example, "a".to_sym becomes :a . It's not specific to Rails; vanilla Ruby has it as well. It looks like in some versions of Ruby, a symbol could be converted to and from a Fixnum as well. But irb from Ruby 1.9.2-p0, from ruby-lang.org, doesn't allow that unless you add your own to_sym method to Fixnum. I'm not sure whether Rails does that, but it doesn't seem very useful in any case. 来源： https:

问题 I need to expose the " is mapped? " state of an instance of a class. The outcome is determined by a basic check. It is not simply exposing the value of a field. I am unsure as to whether I should use a read-only property or a method. Read-only property: public bool IsMapped { get { return MappedField != null; } } Method: public bool IsMapped() { return MappedField != null; } I have read MSDN's Choosing Between Properties and Methods but I am still unsure. 回答1: The C# standard says § 8.7.4 A

问题 I have an enum class with two values, and I want to create a method which receives a value and returns the other one. I also want to maintain type safety(that's why I use enum class instead of enums). http://www.cplusplus.com/doc/tutorial/other_data_types/ doesn't mention anything about methods However, I was under the impression that any type of class can have methods. 回答1: No, they can't. I can understand that the enum class part for strongly typed enums in C++11 might seem to imply that

问题 NetBeans 7.4 beta is currently available for public download, and it introduces a weird warning rule by default: Method length is 16 lines (10 allowed) My question is: Is this an accepted code convention rule, that can be proven somehow, somewhere ? NetBeans support/devs say it's not a bug, but don't give a statement why they only allow 10 lines, and where exactly this rule has its origin. 回答1: You can change the maximum method/function length warning behavior in NetBeans options (it's under

问题 Ok I do have the following code def update_state_actions states.each do |state| @state_turns[state.id] -= 1 if @state_turns[state.id] > 0 && state.auto_removal_timing == 1 end end now in the line of... @state_turns[state.id] -= 1 if @state_turns[state.id] > 0 && state.auto_removal_timing == 1 it says the error in 'block update_state_actions' : Undefined method '>' for nil:NilClass <NoMethodError> what is the cause of the error? how come > is considered as a method but it is a logical operator

问题 I checked the source code of Object class where I found that method declaration of getClass() was public final native Class<?> getClass(); And the declaration of hashCode() was public native int hashCode(); Why are these two methods native methods in the class and how can I get the source code of those methods? 回答1: You can find the complete source code of the native methods here I hope this will work for you. These are native methods, because it has to interact with the machine. Here machine

问题 I always thought functions and methods were the same, until I was learning Swift through the "Swift Programming Language" eBook. I found out that I cannot use greet("John", "Tuesday") to call a function that I declared inside a class, as shown in the eBook in the screen shot below: I received a error saying that " Missing argument label 'day:' in call " as per this screen shot: Here is the code:- import Foundation import UIKit class ViewController2: UIViewController { override func

问题 Here is my coding: For some reason, at the very end, when I'm trying to return winscounter and losscounter, it says unreachable statement but not for the tiescounter. I can't figure out why! If anyone can answer this, it would be greatly appreciated!! public class RockPaperScissors { /** * @param args the command line arguments */ static int value; //computer's choice static int choice; //user choice static int tiescounter = 0; static int winscounter = 0; static int losscounter = 0; public