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问题 I'm working through the book Head First C# (and it's going well so far), but I'm having a lot of trouble wrapping my head around the syntax involved with using the "this." keyword. Conceptually, I get that I'm supposed to use it to avoid having a parameter mask a field of the same name, but I'm having trouble actually tracking it through their examples (also, they don't seem to have a section dedicated to that particular keyword, they just explain it and start using it in their examples).

问题 Is there a keyword to refer to the current class type similar to how this refers to the current instance? My intention is to avoid having to type the full class name when refering to static members or Enums but I want to prefex it with something like "this" for readability like I do for instance members. The reason being some of the class names are pretty huge and cause excessive wrapping. 回答1: I don't think there's a keyword, but maybe as good: this.GetType(); GetType is one of the few

问题 I'm using the services directive in Angularjs not factory and I need to populate a json file to local variable; /* Contains projects on the town */ leMaireServicess.service('cityService', function($http) { // JSON regions and cities loader this.cities = []; // initCities this.initCities = function() { this.cities = $http.get('data/census/cities.js').success(function(data) { return data; }); return this.cities; }; // Get city info this.getCity = function() { return this.cities; }; }); And in

问题 I'm having trouble getting jQuery's $(this) function to work as expected... or rather, to work at all. As I understand it, both $('.chamber').each(function(){ $(this).find('.cell').slice(0,19).css('background-color','red'); }); and $('.chamber').each(function(){ $('.cell',this).slice(0,19).css('background-color','red'); }); should do the same thing: select the first 20 (or 19?) .cell s in each .chamber , and make them red. Unfortunately, what actually happens is they both throw the same error

问题 I have this class where I have a private property and a public method for access: Person = function () { this.Name = "asd"; var _public = new Object(); _public.Name = function (value) { if (value == undefined) { //Get return this.Name } else { this.Name = value; //Set } }; return _public; }; I want to force the context in _public.Name for access a this.Name . I know the technique of closure, but I want to see if I can force a context. I found a technique to do it, extend object Function:

问题 I'm trying to cycle through some table rows. The simplified rows are as follows: <table> <tr id="ucf48"> <td class="ucf_text"> <input name="ucf_t48" value="Ann becomes very involved in the text she is reading." type="text"> </td> </tr> <tr id="ucf351"> <td class="ucf_text"> <input name="ucf_t351" value="Ann is a fast and confident reader." type="text"> </td> </tr> </table> I'm using this code to cycle: $('#ucf tr').each(function(i,obj){ var cn=$(this).attr('id').substr(3); var t=$(this +'.ucf

问题 I have the following class interface: class Time { public: Time( int = 0, int = 0, int = 0 ); Time &setHour( int ); Time &setMinute( int ); Time &setSecond( int ); private: int hour; int minute; int second; }; The implementation is here: Time &Time::setHour( int h ) { hour = ( h >= 0 && h < 24 ) ? h : 0; return *this; } Time &Time::setMinute( int m ) { minute = ( m >= 0 && m < 60 ) ? m : 0; return *this; } Time &Time::setSecond( int s ) { second = ( s >= 0 && s < 60 ) ? s : 0; return *this; }

问题 The specific use where I thought of this problem is as follows, but it's much more generalized. I have a custom JFrame class which also serves as an ActionListener for its components. So my constructor looks something like the following: private JButton myButton; public MyCustomFrame() { super(); myButton.addActionListener(this); // ... more stuff } My question is, how does this actually work behind the scenes? If the constructor is what "creates" the object which is referenced by this , how

问题 The specific use where I thought of this problem is as follows, but it's much more generalized. I have a custom JFrame class which also serves as an ActionListener for its components. So my constructor looks something like the following: private JButton myButton; public MyCustomFrame() { super(); myButton.addActionListener(this); // ... more stuff } My question is, how does this actually work behind the scenes? If the constructor is what "creates" the object which is referenced by this , how

问题 The c++ standard (ISO c++11) mentions in Section 9.3.1 that A non-static member function may be called for an object of its class type, or for an object of a class derived (Clause 10) from its class type, using the class member access syntax (5.2.5, 13.3.1.1). An attempt to compile this code with g++ (version 4.8.2) class foo{ public: void bar(){ cout<<"hey there"<<endl; } }; int main(){ foo obj; foo::bar(&obj); } gives a compile time error because it couldn't match the function's signature.