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下载器使用指导 · App Inventor 2 中文网
...件积木中。
when 按钮1.Click() {
下载器1.Download("https://www.fun123.cn/static/images/logo.png", "")
}
when 下载器1.DownloadProgress(编号, 已下载, 总大小, 百分比) {
标签1.Text = join("已下载 ", 百分比, "%")
}
when 下载器1.DownloadCompleted(编号, 文件路...
Good tutorials on XMPP? [closed]
...chnical: https://web.archive.org/web/20170916193014/http://www.adarshr.com/fun-with-xmpp-and-google-talk and the second part, https://web.archive.org/web/20171005104211/http://www.adarshr.com:80/fun-with-xmpp-and-google-talk-part-2
It explains what stanzas are, what types are available and stuff.
...
Getting the class name from a static method in Java
...eally handy in some cases, e.g. logger instance for the kotlin upper-level functions (in this case kotlin creates a static Java class not accessible from the kotlin code).
We have a few different variants for getting this info:
new Object(){}.getClass().getEnclosingClass();
noted by Tom Hawtin - ...
Where can I learn jQuery? Is it worth it?
...nt programming perspective, b) the grief it causes it you, and c) how much fun it can be!
http://www.west-wind.com/weblog/
http://mattberseth.com/
I used the book jQuery in Action
http://www.amazon.com/jQuery-Action-Bear-Bibeault/dp/1933988355/ref=sr_1_1?ie=UTF8&s=books&qid=1219716122&a...
What happens when a duplicate key is put into a HashMap?
...me as well! I did have to add a "remove" method to it to perform the same functionality as a normal Map but worked great!
– JGlass
Oct 16 '18 at 17:20
1
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图片轮播使用指导 · App Inventor 2 中文网
...nitialize() {
图片轮播1.Images = list("1.jpg", "2.jpg", "https://www.fun123.cn/static/images/logo.png")
}
常见问题
现象
检查
拖进来什么都不显示
还没有设置图片；在设计器的图片列表字串...
Standardize data columns in R
... a dataframe and all the columns are numeric you can simply call the scale function on the data to do what you want.
dat <- data.frame(x = rnorm(10, 30, .2), y = runif(10, 3, 5))
scaled.dat <- scale(dat)
# check that we get mean of 0 and sd of 1
colMeans(scaled.dat) # faster version of appl...
Why does Boolean.ToString output “True” and not “true”
...Microsoft can really answer that question. However, I'd like to offer some fun facts about it ;)
First, this is what it says in MSDN about the Boolean.ToString() method:
Return Value
Type: System.String
TrueString if the value of this
instance is true, or FalseString if
the value ...
Can you supply arguments to the map(&:method) syntax in Ruby?
...
I like this solution, but I think you can have even more fun with it. Instead of defining a with method, define call. Then you can do things like a.map(&:+.(2)) since object.() uses the #call method. And while you're at it, you can write fun things like :+.(2).(3) #=> 5 -...
Does Java read integers in little endian or big endian?
...mats that use some form of Huffman encoding (i.e. all of them). For extra fun, JPEG is "bitwise big-endian" (i.e. the most significant bit is the "first" bit) and LZ is "bitwise little-endian". I once worked on a proprietary compression format that used both formats under the hood. Oh, that was f...