parentheses

问题 If I include a single parenthesis in a :contains selector I get an error. e.g. $("a:contains('Speed (mph')") returns the error Syntax error, unrecognized expression: (mph') if I add the closing parenthesis at the end, the statement runs fine. however, I need to be able to query where there is often a single parenthesis. What's going on here and how do I sidestep this? EDIT In my actual code the :contains part is passed in as a variable e.g var searchText = 'Speed (mph'; var result = $("a

问题 Had a look around the questions on this site and could not quite find the answer I was looking for about type casting the Math.random() method from double to int. My question is, why does Math.random only return a 0 without parentheses whereas it returns random numbers when it is contained within the parentheses? The first part of code returns 0: int number; number = (int) Math.random() * 10; System.out.println("\nThe random number is " + number); This code works however: int number; number =

问题 This question already has answers here : Closed 8 years ago . Possible Duplicate: Cannot use parentheses when calling a Sub As far as I am aware this is correct but i get the error "Cannot use parentheses when calling a Sub" Never used ASP before...can anyone shed light o nthe issue for me? code: <%TESTWeb1.RecentlyViewedDisplay("Recently Viewed Header","Recently Viewed Entry","Recently Viewed Group Entry")%> 回答1: In VB6 type languages you only need parentheses when calling a function, or

问题 Usually code looks like this: (one-thing (another-thing arg1 (f arg5 r)) (another-thing arg1 (f arg5 r))) Why doesn't it like this?: (one-thing (another-thing arg1 (f arg5 r)) (another-thing arg1 (f arg5 r)) ) It allows adding and removing "another-thing" lines more easily (without removing and re-adding trailing closing parenthesis). Also you can put a some comment on that lone closing parenthesis (such as "; end of the loop"). How bad is it when I mix by code that uses the second style with

问题 I'v always wondered what they're used for? Seems silly to put them in every time if you can never put anything inside them. function_name () { #statements } Also is there anything to gain/lose with putting the function keyword at the start of a function? function function_name () { #statements } 回答1: The keyword function has been deprecated in favor of function_name() for portability with the POSIX spec A function is a user-defined name that is used as a simple command to call a compound

问题 I have come across a self executing function that executes on a condition that the declared containing var exists, and if it doesn't exist it is passed an object. Example: var myFunc = (function(myFunc){}(myFunc || {})); How come there is an "or" condition operator that passes an object ? 回答1: var myFunc = (function(myFunc){}(myFunc||{})); This doesn't make any sense because the myFunc Argument will always be {} - I'm confused by that. Ill explain one that does First Example var cool = {

问题 Sometimes when I use the print function, parentheses and quotation marks appear in the output. I'm using Python 3.4 and writing the code in Sublime Text on a mac. Here's an example Input: a=2 print("a",a) Output: ('a', 2) I'd like to show only a and 2. Thanks in advance! 回答1: You appear to be using Python 2. a = 2 print("a %i" % a) should give you the results you're looking for. Or, using the newer str.format() method: print("a {}".format(a)) In Python 3, your statement print("a",a) will work

问题 This question already has answers here : Closed 7 years ago . Possible Duplicate: C++ Comma Operator I came across unexpected (to me at least) C++ behavior today, shown by the following snippit: #include <iostream> int main() { std::cout << ("1", "2") << std::endl; return 0; } Output: 2 This works with any number of strings between the parentheses. Tested on the visual studio 2010 compiler as well as on codepad. I'm wondering why this compiles in the first place, what is the use of this

问题 I'm in need of a regular expression that can remove unnecessary/extra parenthesis in a string if found. Example: Bob Barker LIVE! (((Don't Miss out!))) Wanted Result: Bob Barker LIVE! (Don't Miss out!) I don't care if users you them, as long as they don't over use them, and make sure to close them. Thanks for any feedback. 回答1: That's easy enough. preg_replace('~[\(\)]+~', '', $string); Edit: I didn't read your whole question. You still want parenthesis, just not duplicates. preg_replace

问题 This question already has answers here : Closed 7 years ago . Possible Duplicate: Double parentheses in sample code Often the init method in an Objective-C class will have the following line: if ((self = [super init])) { ... I'm just wondering if the extra parentheses are necessary. Is the following line equivalent? if (self = [super init]) { ... Edit: This is indeed a duplicate of Double parentheses in sample code 回答1: They are not necessary, but using (( and )) say "yes, I mean an