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二维码的生成细节及原理 - 更多技术 - 清泛网 - 专注C/C++及内核技术
.../qr_code.pdf
基础知识
首先，我们先说一下二维码一共有40个尺寸。官方叫版本Version。Version 1是21 x 21的矩阵，Version 2是 25 x 25的矩阵，Version 3是29的尺寸，每增加一个version，就会增加4的尺寸，公式是：(V-1)*4 + 21（V是版本号） 最...
Remove outline from select box in FF
...he color of the dotted border. So say if you do...
select {
color: rgba(0,0,0,0);
}
Firefox will render the dotted border transparent. But of course your text will be transparent too! So we must somehow display the text. text-shadow comes to the rescue:
select {
color: rgba(0,0,0,0);
text-...
In Markdown, what is the best way to link to a fragment of a page, i.e. #some_id?
...|
edited May 23 '17 at 12:02
Community♦
111 silver badge
answered Sep 7 '11 at 14:43
...
Android Paint: .measureText() vs .getTextBounds()
...
+100
You can do what I did to inspect such problem:
Study Android source code, Paint.java source, see both measureText and getTextBounds ...
&& (AND) and || (OR) in IF statements
...
206
No, it will not be evaluated. And this is very useful. For example, if you need to test whether...
How do I *really* justify a horizontal menu in HTML+CSS?
...e-between - (example here):
ul {
list-style: none;
padding: 0;
margin: 0;
}
.menu {
display: flex;
justify-content: space-between;
}
<ul class="menu">
<li>Item One</li>
<li>Item Two</li>
<li>Item Three Longer</li...
Why are flag enums usually defined with hexadecimal values
...bit shifts seems the most clear:
[Flags]
public enum MyEnum
{
None = 0,
Flag1 = 1 << 0,
Flag2 = 1 << 1,
Flag3 = 1 << 2,
Flag4 = 1 << 3,
Flag5 = 1 << 4
}
share
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XSD: What is the difference between xs:integer and xs:int?
...
110
The difference is the following:
xs:int is a signed 32-bit integer.
xs:integer is an integer un...
How to print number with commas as thousands separators?
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pepoluan
4,10222 gold badges2828 silver badges5252 bronze badges
answered May 24 '12 at 18:02
Ian SchneiderIan Sc...
public friend swap member function
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edited Jan 5 at 11:05
Matthew K.
31533 silver badges77 bronze badges
answered Apr 17 '11 at 19:24...