大约有 16,000 项符合查询结果（耗时：0.0334秒） [XML]
Is there a better way to do optional function parameters in JavaScript? [duplicate]
...
Your logic fails if optionalArg is passed, but evaluates as false - try this as an alternative
if (typeof optionalArg === 'undefined') { optionalArg = 'default'; }
Or an alternative idiom:
optionalArg = (typeof optionalArg === '...
RegEx to parse or validate Base64 data
Is it possible to use a RegEx to validate, or sanitize Base64 data? That's the simple question, but the factors that drive this question are what make it difficult.
...
Converting from Integer, to BigInteger
I was wondering if there was any way to convert a variable of type Integer, to BigInteger. I tried typecasting the Integer variable, but i get an error that says inconvertible type.
...
Can't find the 'libpq-fe.h header when trying to install pg gem
I am using the Ruby on Rails 3.1 pre version. I like to use PostgreSQL, but the problem is installing the pg gem. It gives me the following error:
...
How to return a part of an array in Ruby?
...
Yes, Ruby has very similar array-slicing syntax to Python. Here is the ri documentation for the array index method:
--------------------------------------------------------------- Array#[]
array[index] -> obj...
Best practices/performance: mixing StringBuilder.append with String.concat
I'm trying to understand what the best practice is and why for concatenating string literals and variables for different cases. For instance, if I have code like this
...
Passing parameters to JavaScript files
...that I want to use which requires certain variables be defined in my web page.
14 Answers
...
How to customize an end time for a YouTube video?
I'm trying to figure out how I can specify a custom end time for an embedded YouTube video. I know that I can customize the start time by adding &start=30 , but I haven't seen anything relating to the end time.
...
Repeat string to certain length
... is an efficient way to repeat a string to a certain length? Eg: repeat('abc', 7) -> 'abcabca'
13 Answers
...
Excel “External table is not in the expected format.”
I'm trying to read an Excel (xlsx) file using the code shown below. I get an "External table is not in the expected format." error unless I have the file already open in Excel. In other words, I have to open the file in Excel first before I can read if from my C# program. The xlsx file is on a share...