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为AppInventor2开发自己的拓展(Extension) - App Inventor 2 拓展 - 清泛IT社区，为创新赋能！
来源中文网文档：https://www.fun123.cn/reference/extensions/aix_dev.html
为什么需要开发拓展？App Inventor 2 是积木式在线安卓开发环境，利用拖拽式的方式实现代码块堆叠，从而完成相应的逻辑。上手很容易，但是由于代码块提供的功能...
C#操作XML小结 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...mlSchema("your xmlfile name");
第二种方法：
<aaa>
<add key="123" value="321"/>
</aaa>
如果我要找到123然后取到321应该怎么写呢？
using System.XML;
XmlDataDocument xmlDoc = new System.Xml.XmlDataDocument();
xmlDoc.Load(@"c:/Config.xml");
XmlElement elem = xmlDoc....
Abandoning changes without deleting from history
...r you is to mark the old branch as "closed". If your old head is revision "123" then:
hg update -r 123
hg commit --close-branch -m 'Closing old branch'
hg update -C default
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How to print formatted BigDecimal values?
...nts money, and I need to print its value in the browser in a format like $123.00 , $15.50 , $0.33 .
6 Answers
...
How can I move a tag on a git branch to a different commit?
...imately has a problem and needs to be updated/re-released.
git tag -d fix123 # delete the old local tag
git push github :fix123 # delete the old remote tag (use for each affected remote)
git tag fix123 790a621265 # create a new local tag
git push github fix123 ...
Submitting HTML form using Jquery AJAX
... answered May 1 '13 at 18:27
abc123abc123
15.5k66 gold badges4444 silver badges7373 bronze badges
...
How to get rid of the 'undeclared selector' warning
...se a leak because its selector is unknown".
– Hampden123
Nov 20 '13 at 16:38
1
@Hampden123: that ...
Reshaping data.frame from wide to long format
... 1952 10,058
7: AFG Afghanistan 1953 23,557
8: ALB Albania 1953 11,123
9: AFG Afghanistan 1954 24,555
10: ALB Albania 1954 12,246
Some alternative notations:
melt(setDT(wide), id.vars = 1:2, variable.name = "year")
melt(setDT(wide), measure.vars = 3:7, variable.name = "year")
melt...
Using Regular Expressions to Extract a Value in Java
...e matcher for pattern p and given string
Matcher m = p.matcher("Testing123Testing");
// if an occurrence if a pattern was found in a given string...
if (m.find()) {
// ...then you can use group() methods.
System.out.println(m.group(0)); // whole matched expression
...
How do I get the key at a specific index from a Dictionary in Swift?
...ere is no guarantee it will come out ordered like below)
let dict = ["c": 123, "d": 045, "a": 456]
for (index, entry) in enumerate(dict) {
println(index) // 0 1 2
println(entry) // (d, 45) (c, 123) (a, 456)
}
If you want to sort first..
var sortedKeysArray = sorted(dict...