scope

问题 I'm still fairly new to PHP and so I'm attempting to understand scope concepts within PHP web applications. In the Java world a Java web app - using Java Server Pages (JSP) and upward - will allow a Java Bean to have the following levels of scope: Page Request Session Application Attempting to map these to PHP's scoping capabilities: Page: not really but objects that are local to a call are considered 'gone' after the function call is made so it's sort of like a page scope Request: made by

问题 I'm writing a class that extends from Scanners which forces me to define the type Token : object MyScanner extends Scanners { type Token = ... } The problem is that my token class itself is called Token : abstract class Token(...) case class Literal(...) ... Is it in Scala somehow possible to define the type Token of Scanners to my Token class? type Token = Token obviously doesn't work. I also tried using the whole package name (which begins with main.scala ) like this: type Token = main

问题 If I declare a function inside document.ready, I get an error. Like this $(document).ready(function(){ function updateSizeOptions() { alert("updateSizeOptions"); } var jGrid = $("#list_main"); jGrid.jqGrid({ url:'db.php?ajaxOp=getData', colModel:[ $.extend(true, { name:'shape_id' ,index:'shape_id' ,edittype:'select' ,formatter:'select' ,editoptions: { onclick:"javascript:updateSizeOptions();" } } ,{} ] .... }); It will give Error : "ReferenceError: updateSizeOptions is not defined". But If I

问题 I want to create a scope with some conditions, with one returning not a specific scope. For now, this solution works: scope :my_scope, ->(my_var) { scope = where('TRUE') if my_var.condition1? scope = scope.where({ :some_condition => :some_value }) end if my_var.condition2? scope = scope.where({ :some_condition => :some_value }) end scope } Is there any other better solution to do this ? Regards 回答1: In Rails 4, you can simply use all : scope :my_scope, ->(my_var) { if my_var.condition? where

问题 I've inherited some code which I'm going to be refactoring that makes extensive use of multiple variables at different scopes having the same name, ie: int test = 456; int main(void) { int test = 0; //... for (i=0; i<MAX_VAL; i++) { int test = 123; //... } return 0; } I know that if the same variable name is only used at two relevant levels of scope, I can access the globally accessible one by declaring extern int test within the deeper/lower levels of scope. With more than two levels though,

问题 Is this possible to add variable to callback scope? What I want to achieve is: ... Foo.prototype.bar = function(fn) { var baz = "baz!"; fn.call(this); } ... Foo.bar(function() { console.log(baz) // gives "baz!" }); I know I can pass baz variable as an argument or this but I'm interested in something like above. 回答1: No, it's not possible. The only ways are the ones you pointed out: as an argument or in this . 回答2: What about doing it this way: var Foo = function(){} Foo.prototype.handle =

问题 Closed . This question needs to be more focused. It is not currently accepting answers. Want to improve this question? Update the question so it focuses on one problem only by editing this post. Closed 3 years ago . I had a couple thoughts on this. The first is that allocating global variables may be faster, since they are only allocated once, at the time the program is first spawned, whereas local variables must be allocated every time a function is called. My second thought is that since

问题 Is there an Objective-C runtime library function ( unlikely ) or set of functions capable of inspecting static (quasi-class level) variables in Objective-C? I know I can utilize a class accessor method but I'd like to be able to test without writing my code "for the test framework". Or , is there a obscure plain C technique for external access to static vars? Note this information is for unit testing purposes—it needn't be suitable for production use. I'm conscious that this'd go against the

问题 I have a component like: Check Plunkr Example ( Updated and Working with the solution :) Thanks ) my-component.js declaration (function() { 'use strict'; angular .module('app') .component("myComponent", { bindings: { obj: "=" }, controller: "ComponentController", controllerAs: "vm", template: '<section class="result"><h2>{{vm.title}}</2>' + '<h3>Using the Parent Controller values</h3>' + '<ul><li>{{ vm.obj.a }}</li><li>{{vm.obj.b}}</li></ul>' + '<h3>Using the Children controller values:'+ '

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: