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TCP 的那些事儿（下） - 更多技术 - 清泛网 - 专注C/C++及内核技术
...是所谓的MSS（Max Segment Size）注意，TCP的RFC定义这个MSS的默认值是536，这是因为 RFC 791里说了任何一个IP设备都得最少接收576尺寸的大小（实际上来说576是拨号的网络的MTU，而576减去IP头的20个字节就是536）。
如果你的网络包可以...
in iPhone App How to detect the screen resolution of the device
In iPhone App,
while running the App on device How to detect the screen resolution of the device on which App is running?
6...
How can one display images side by side in a GitHub README.md?
...t as well. (Well, I can vouch at least that it works on their pull request screen.)
– Nate Cook
Dec 20 '17 at 1:27
2
...
Window appears off screen on ubuntu [closed]
...ors several times, and now for some reason some of the windows open up off-screen (outside of both screens), Update Manager, for instance.
How can I position the windows on one of my screens?
...
“:” (colon) in C struct - what does it mean? [duplicate]
...ary.
This example defines a two-dimensional array of structures named screen.
struct
{
unsigned short icon : 8;
unsigned short color : 4;
unsigned short underline : 1;
unsigned short blink : 1;
} screen[25][80];
Edit: another important bit from the MSDN link:
Bit fields...
UICollectionView Set number of columns
...e method responsible for determining the size of the Cell. I then took the screen width and divided it with my column requirement. For example, I wanted to have 3 columns on each screen size. So here's what my code looks like -
- (CGSize)collectionView:(UICollectionView *)collectionView
...
Understand convertRect:toView:, convertRect:FromView:, convertPoint:toView: and convertPoint:fromVie
... hierarchy has it's origin at 0,0 which corresponds to the top left of the screen in iOS.
If you add a subview at 20,30 to this view, then a point at 0,0 in the subview corresponds to a point at 20,30 in the superview. This conversion is what those methods are doing.
Your example above is pointl...
What is aria-label and how should I use it?
...
It's an attribute designed to help assistive technology (e.g. screen readers) attach a label to an otherwise anonymous HTML element.
So there's the <label> element:
<label for="fmUserName">Your name</label>
<input id="fmUserName">
The <label> explicitl...
iPhone 5 CSS media query
The iPhone 5 has a longer screen and it's not catching my website's mobile view. What are the new responsive design queries for the iPhone 5 and can I combine with existing iPhone queries?
...
When to use IMG vs. CSS background-image?
...the meaning of the image can be communicated in all user-agents, including screen readers.
Pragmatic uses of IMG
Use IMG plus alt attribute if the image
is part of the content such as a logo or diagram or person (real person, not stock photo people).
—sanchothefat
Use IMG if you rely on bro...