scope

How to stop a variable from being destroyed on pressing F5 in javascript

由 喜夏-厌秋 提交于 2019-12-12 21:26:00
问题 I have the following code <html> <head> <script> var m=0; function add() { m++; } </script> </head> <body> <button onclick="add();">click</button> </body> </html> But if I refresh the page then again the value of m starts from 0. How can I persist the value of m between each load of the page on a client machine? 回答1: you can use cookies from javascript. check this link. http://www.w3schools.com/js/js_cookies.asp here is the working code sample: <html> <head> <script> var m=getCookie("m"); if

Javascript scope problem

由 青春壹個敷衍的年華 提交于 2019-12-12 21:23:18
问题 I am calling this function, assigning the result to a variable in the callback and then logging the result, but I keep getting undefined. var id; test.getID(function(result) { id=result; }); console.log(id); If I change it to the code below, then I can see the id logged. var id; test.getID(function(result) { id=result; console.log(id); }); Do you know what I can do to be able to access the result of the getID function? 回答1: The getID function will need to invoke its parameter before you will

Is a variable declared in a loop body preserved during iterations?

由 梦想与她 提交于 2019-12-12 20:25:30
问题 Consider a loop in C which declares a character array in the loop's body. At each iteration, a character of array is modified until the end is reached. At the end, the variable is printed. The description would expand to the next code: #include <stdio.h> int main(void) { int i = 0; for (;;) {/* same as: while(1) { */ char x[5]; x[i] = '0' + i; if (++i == 4) { x[i] = '\0'; /* terminate string with null byte */ printf("%s\n", x); break; } } return 0; Many may expect 0123 as output. But for some

How to set global process variables in Camunda-BPM?

由 若如初见. 提交于 2019-12-12 20:03:22
问题 I have a simple bpmn process in which i am using 2 service task,I am executing my process by using processEngine.getRuntimeService().startProcessInstanceByKey("Process_1", variables); where my variables is as follows: Map variables = new HashMap(); variables.put("a", 2); variables.put("b", 5); Service task 1 implements an Addition java class and service task 2 implements a Multiplication class. Now I want to have 3 variables (constants) c = 5 , d = 10 , e = 2 so that I can use c for service

Javascript/jQuery variables not giving expected values

由 假如想象 提交于 2019-12-12 19:06:52
问题 Like others before me I'm struggling with scope in Javascript. (That and trying to read the darn stuff). I have checked some of the previous threads on this question but I cant seem to get them to apply correctly to my issuue. In the example below, I want to manipulate the values in the tagsArr array, once the array has been fully populated. I declared the tagsArr variable outside the scope of the function in which it is populated in order to access it globally. But the variable doesn't seem

Scope of an inside-parenthesis declared object

由 北城余情 提交于 2019-12-12 18:28:21
问题 If I declare an object like this: void main() { myclass objectA(anotherclass(true,true,0)); } i.e. I create an objectA and another object "anotherclass" by directly calling the latter's constructor, what is "anotherclass"'s scope? Does it get destructed only when main() finishes? 回答1: The temporary gets destructed at the end of the full expression that contains it, i.e. when the call to the constructor of myclass returns. Per Paragraph 12.2/3 of the C++11 Standard: Temporary objects are

Is there a difference between global Initialization vs viewDidLoad initialization in Swift

由 雨燕双飞 提交于 2019-12-12 18:03:14
问题 If I have a class and initialize a variable like so: class TestClass: UIViewController { var thisInt: Int = 10 } is that any different than initializing like so: class TestClass: UIViewController { var thisInt: Int! override func viewDidLoad() { super.viewDidLoad() thisInt = 10 } } I suppose my main questions lie in when the global initialization takes place, and is there a time when one would get called more than the other would be called with normal iOS Programming (not doing anything

Using let variables in a lambda in Scheme

由 喜你入骨 提交于 2019-12-12 16:42:03
问题 This question is similar in scope to: In R6RS Scheme, is there a way to get the current environment for use with eval? but I'd like to take it a step further and ask how you'd remedy something like this. My issue is further confounded in that in my case '(+ x y) is an arbitrary unevaluated lambda statement. Unevaluated because it may contain calls to variables that are part of the let (and since Scheme doesn't have faith that the procedure will be called in an environment containing those

Passing a Enum value as a parameter from JSF (revisited)

由 跟風遠走 提交于 2019-12-12 16:18:32
问题 Passing a Enum value as a parameter from JSF This question already deals with this issue, however the proposed solution has not worked for me. I define the following enumeration in my backing bean: public enum QueryScope { SUBMITTED("Submitted by me"), ASSIGNED("Assigned to me"), ALL("All items"); private final String description; public String getDescription() { return description; } QueryScope(String description) { this.description = description; } } Then I use it as a method parameter

Scope of Groovy's metaClass?

由 老子叫甜甜 提交于 2019-12-12 16:03:29
问题 I have an application which can run scripts to automate certain tasks. I'd like to use meta programming in these scripts to optimize code size and readability. So instead of: try { def res = factory.allocate(); ... do something with res ... } finally { res.close() } I'd like to Factory.metaClass.withResource = { c -> try { def res = factory.allocate(); c(res) } finally { res.close() } } so the script writers can write: factory.withResource { res -> ... do something with res ... } (and I could
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