methods

问题 How is it that Ruby allows a class access methods outside of the class implicitly? Example: class Candy def land homer end end def homer puts "Hello" end Candy.new.land #Outputs Hello 回答1: The definition of the "homer" method is adding the method to the Object class. It is not defining a free function. Class Candy implicitly inherits from Object, and so has access to the methods in Object. When you call "homer" in the "land" method, the method resolution can't find a definition in the current

问题 I am working with a site that uses "xsl method:xml" to create html templates. However, I am running into an issue with the tag self-closing when the html page is rendered by the xsl engine. <div></div> transforms to => <div/> This problem is compounded by the fact that the method needs to stay xml, or the other components of the page will not render correctly. Any ideas on how tell xsl to make a special exception for the node <div> ? This question is similar to this question, except I want to

问题 In a class, I have 2 methods. In method1 I created an object, but I can't use the same object in method2. Why? Please help with a simple example. The coding is too big, so I have given the layout public class Sub { } public class DataLoader { public void process1() { Sub obj = new Sub(); } public void process2() { // here I can't use the object } } 回答1: The reason why this isn't working is scope. A local variable can only be accessed from the block it is declared in. To access it from

问题 I have to call a callback method in iframe to return a value to opener. I know SqueezeBox has "assign, open, close" static methods, but I do not understand how it works, can someone help me please? 回答1: I don't know much about SqueezeBox but I have done some work with iframe communication. Unless your iFrame and opener are in the same domain, you cannot call from one to the other. What I have done to work around this is write to the hash of the URL. The opener can then read this value and

问题 I'm using the latest version of the jQuery Validator plugin along with jQuery (1.6.2). In my optional field for phone number, I have a defaultValue . HTML: <input type="text" class="autoclear blur" value="your telephone number" name="Phone" /> I installed a custom method for validating phone numbers as per this thread. The idea is that even though the field is optional, I still want to validate it if/when text is entered. jQuery/JavaScript: $(document).ready(function() { var nameMsg = "Please

问题 Can we swap two numbers in Java using pass by reference or call by reference? Recently when I came across swapping two numbers in Java I wrote class Swap{ int a,b; void getNos(){ System.out.println("input nos"); a = scan.nextInt(); b = scan.nextInt(); // where scan is object of scanner class } void swap(){ int temp; temp = this.a; this.a = thisb; this.b = this.a; } } In the main method I call the above mentioned methods and take two integers a , b and then using the second method I swap the

问题 From what I know, C# allows that only the last parameter of a method is of "variable length", for example: T f(A a, params B[] b) allows that if you have A r; .... B x, y, z; .... you can call f like f (r, x, y, z) . Why C# doesn't also define something like: T f(params A[] a, params B[] b) 回答1: Because how would the compiler know when the variable arguments for the first parameter stop? Pleas tell me what argOne and argTwo should contain inside of the method body: void Foo( params object[]

问题 I need to know whether the method is declared as static given its name and the name of the class containing it. method_exists provides true for both static and non-static methods. 回答1: use ReflectionMethod::isStatic 回答2: Here's a little more clear way on how to use ReflectionMethod: $MethodChecker = new ReflectionMethod($ClassName,$MethodName); var_dump($MethodChecker->isStatic()); 来源： https://stackoverflow.com/questions/7513589/how-to-check-whether-a-method-is-static-in-php

问题 I would like to ask a question about methods' const-correctness. Let me illustrate the situation. class MyClass { public: ... void DiscussedMethod() { otherClass->NonConstMethod(); } private: OtherClass *otherClass; }; I have a class MyClass which keeps a pointer to OtherClass . In DiscussedMethod it calls OtherClass::NonConstMethod which modifies some visible data. I would like to know, whether it would be a good practice to make the DiscussedMethod const (since it doesn't modify any member

问题 I'm trying to detect whether the shift key is being pressed while the cursor is moved over a particular element. The function fires, but only after I click on another element first. Is there some way to work around this? I've tried setting focus to both the document and element, and tried creating a pseudo-click function but so far nothing has worked. For example, the following code works only after I click another element on the page: $("#selector").mouseover(function(e){ if(e.shiftKey) {