大约有 40,000 项符合查询结果（耗时：0.0317秒） [XML]
How can I check for “undefined” in JavaScript? [duplicate]
What is the most appropriate way to test if a variable is undefined in JavaScript?
16 Answers
...
How to Generate unique file names in C#
...too, and doesn't suffer from race conditions.
For example, if you pass it test.txt, it will attempt to create files in this order:
test.txt
test (2).txt
test (3).txt
etc. You can specify the maximum attempts or just leave it at the default.
Here's a complete example:
class Program
{
stati...
Oracle的列操作(增加列,修改列,删除列)，包括操作多列 - 数据库(内核) - 清...
...改列,删除列)，包括操作多列增加一列： alter table emp4 add test varchar2(10);修改一列： alter table emp4 modify test varchar2(20);删除一列：alter 增加一列：
alter table emp4 add test varchar2(10);
修改一列：
alter table emp4 modify test varchar2(20);
...
Sort a text file by line length including spaces
...
Answer
cat testfile | awk '{ print length, $0 }' | sort -n -s | cut -d" " -f2-
Or, to do your original (perhaps unintentional) sub-sorting of any equal-length lines:
cat testfile | awk '{ print length, $0 }' | sort -n | cut -d" " -f2...
When is null or undefined used in JavaScript? [duplicate]
...efers to does not exist.
This is one of the few times you may not want to test for equality-
if(x!==undefined) will be true for a null value
but if(x!= undefined) will be true (only) for values that are not either undefined or null.
...
Disable a group of tests in rspec?
I have a test spec which describes a class and within that has various contexts each with various it blocks.
7 Answer...
Mythical man month 10 lines per developer day - how close on large projects? [closed]
...d effort but many interactions wrt product updates and fixes identified in testing.
– J D
May 6 '12 at 10:00
7
...
What is the difference between MVC and MVVM? [closed]
...he need for separate Controllers.
The problem is: that to be independently testable*, and especially reusable when needed, a view-model has no idea what view is displaying it, but more importantly no idea where its data is coming from.
*Note: in practice Controllers remove most of the logic, from th...
How to determine the encoding of text?
...ca -g $tmpfile
echo 'recoding ........'
#iconv -f iso-8859-2 -t utf-8 back_test.xml > $tmpfile
#enca -x utf-8 $tmpfile
#enca -g $tmpfile
recode CP1250..UTF-8 $tmpfile
You might like to check the encoding by opening and reading the file in a form of a loop... but you might need to check the file...
specify project file of a solution using msbuild
...
msbuild test.sln /t:project /p:Configuration="Release" /p:Platform="x86" /p:BuildProjectReferences=false
Notice that what is assigned to /t is the project name in the solution, it can be different from the project file name.
Also,...