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使用App Inventor扩展实现多点触控：Rotation Detector · App Inventor 2 中文网
...Rotation Detector
Xinyue Deng dengxinyue0420@gmail.com
DRAFT (March 6, 2016): Building extensions requires the App Inventor extensions capability, which is not yet incorporated into the App Inventor release. But you can try some ofary AI2 server.
You can implement the RotationDetector.aix exten...
Syntax of for-loop in SQL Server
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216
T-SQL doesn't have a FOR loop, it has a WHILE loop
WHILE (Transact-SQL)
WHILE Boolean_expressi...
How to convert a string to lower case in Bash?
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Bash 4.0
$ echo "${a,,}"
hi all
sed
$ echo "$a" | sed -e 's/\(.*\)/\L\1/'
hi all
# this also works:
$ sed -e 's/\(.*\)/\L\1/' <<< "$a"
hi all
Perl
$ echo "$a" | perl -ne 'print lc'
hi all
Bash
lc(){
case "$1" in
[A-Z])
n=$(printf "%d" "'$1")
n=$((n+32)...
Detecting when user scrolls to bottom of div with jQuery
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14 Answers
14
Active
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Using the “start” command with parameters passed to the started program
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12 Answers
12
Active
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How to write a switch statement in Ruby
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2711
Ruby uses the case expression instead.
case x
when 1..5
"It's between 1 and 5"
when 6
"It'...
The point of test %eax %eax [duplicate]
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166
CMP subtracts the operands and sets the flags. Namely, it sets the zero flag if the difference...
CSS force image resize and keep aspect ratio
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edited Mar 2 '16 at 14:12
Flimm
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