大约有 5,215 项符合查询结果（耗时：0.0215秒） [XML]
How to create a video from images with FFmpeg?
This line worked fine but I want to create a video file from images in another folder.
Image names in my folder are:
4 Answ...
How to get client's IP address using JavaScript?
I need to somehow retrieve the client's IP address using JavaScript; no server side code, not even SSI.
50 Answers
...
Swift Beta performance: sorting arrays
I was implementing an algorithm in Swift Beta and noticed that the performance was very poor. After digging deeper I realized that one of the bottlenecks was something as simple as sorting arrays. The relevant part is here:
...
Bomb dropping algorithm
I have an n x m matrix consisting of non-negative integers. For example:
32 Answers
...
What are the main disadvantages of Java Server Faces 2.0?
Yesterday I saw a presentation on Java Server Faces 2.0 which looked truly impressive, even though I am currently a happy ASP.NET MVC / jQuery developer. What I liked most about JSF was the huge amount of AJAX-Enabled UI components which seem to make development much faster than with ASP.NET MVC, es...
When and why are database joins expensive?
I'm doing some research into databases and I'm looking at some limitations of relational DBs.
7 Answers
...
Context switches much slower in new linux kernels
We are looking to upgrade the OS on our servers from Ubuntu 10.04 LTS to Ubuntu 12.04 LTS. Unfortunately, it seems that the latency to run a thread that has become runnable has significantly increased from the 2.6 kernel to the 3.2 kernel. In fact the latency numbers we are getting are hard to belie...
Simple way to encode a string according to a password?
Does Python have a built-in, simple way of encoding/decoding strings using a password?
19 Answers
...
Daylight saving time and time zone best practices [closed]
I am hoping to make this question and the answers to it the definitive guide to dealing with daylight saving time, in particular for dealing with the actual change overs.
...
Why would you use an ivar?
I usually see this question asked the other way, such as Must every ivar be a property? (and I like bbum's answer to this Q).
...