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How to draw polygons on an HTML5 canvas?
...lineTo (live demo):
var ctx = canvas.getContext('2d');
ctx.fillStyle = '#f00';
ctx.beginPath();
ctx.moveTo(0, 0);
ctx.lineTo(100,50);
ctx.lineTo(50, 100);
ctx.lineTo(0, 90);
ctx.closePath();
ctx.fill();
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parseInt vs unary plus, when to use which?
..., here are a few differences I know of:
An empty string "" evaluates to a 0, while parseInt evaluates it to NaN. IMO, a blank string should be a NaN.
+'' === 0; //true
isNaN(parseInt('',10)); //true
The unary + acts more like parseFloat since it also accepts decimals.
parseInt on...
How to set 'auto' for upper limit, but keep a fixed lower limit with matplotlib.pyplot
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109
You can pass just left or right to set_xlim:
plt.gca().set_xlim(left=0)
For the y axis, use ...
JS文字卷动效果的调用函数：startmarquee - 更多技术 - 清泛网 - 专注C/C++及内核技术
...false直接影响到下面start()函数的执行；
o.scrollTop = 0;
//文字内容顶端与滚动区域顶端的距离，初始值为0；
function start(){
t=setInterval(scrolling,speed); //每隔一段时间，setInterval便会执行一次scrolling函数；speed...
Check if value is in select list with JQuery
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180
Use the Attribute Equals Selector
var thevalue = 'foo';
var exists = 0 != $('#select-box option...
Python, remove all non-alphabet chars from string
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answered Mar 20 '14 at 0:36
limasxgoesto0limasxgoesto0
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Does Ruby regular expression have a not match operator like “!~” in Perl?
... from the documentation page of Regexp. Nevertheless, it works:
irb(main):001:0> 'x' !~ /x/
=> false
irb(main):002:0> 'x' !~ /y/
=> true
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Patterns for handling batch operations in REST web services?
...ce. For example, to delete several messages at once.
DELETE /mail?&id=0&id=1&id=2
It's a little more complicated to batch update partial resources, or resource attributes. That is, update each markedAsRead attribute. Basically, instead of treating the attribute as part of each resourc...
What does .SD stand for in data.table in R
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206
.SD stands for something like "Subset of Data.table". There's no significance to the initial "....
Formatting Numbers by padding with leading zeros in SQL Server
We have an old SQL table that was used by SQL Server 2000 for close to 10 years.
13 Answers
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