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应用工具使用指导 · App Inventor 2 中文网
...先在应用市场上架）：
when 按钮_好评.Click() {
应用工具1.OpenAppMarket("")
}
案例二：打开微信，没装就提示
when 按钮_微信.Click() {
if 应用工具1.IsAppInstalled("com.tencent.mm") {
应用工具1.OpenApp("com.tencent.mm")
} els...
Make a Bash alias that takes a parameter?
...
2193
Bash alias does not directly accept parameters. You will have to create a function.
alias doe...
How can I multiply and divide using only bit shifting and adding?
...
14 Answers
14
Active
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FIND_IN_SET() vs IN()
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100
SELECT name
FROM orders,company
WHERE orderID = 1
AND companyID IN (attachedComp...
Uninstall old versions of Ruby gems
...# choose which ones you want to remove
gem uninstall rjb
# remove version 1.1.9 only
gem uninstall rjb --version 1.1.9
# remove all versions less than 1.3.4
gem uninstall rjb --version '<1.3.4'
share
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How to get the name of the calling method?
...
213
puts caller[0]
or perhaps...
puts caller[0][/`.*'/][1..-2]
...
How do I convert a TimeSpan to a formatted string? [duplicate]
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14 Answers
14
Active
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Length of generator output [duplicate]
...ou have a lazy infinite generator? For example:
def fib():
a, b = 0, 1
while True:
a, b = b, a + b
yield a
This never terminates but will generate the Fibonacci numbers. You can get as many Fibonacci numbers as you want by calling next().
If you really need to know the ...
iOS Image Orientation has Strange Behavior
...
12 Answers
12
Active
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How to format time since xxx e.g. “4 minutes ago” similar to Stack Exchange sites
...nction timeSince(date) {
var seconds = Math.floor((new Date() - date) / 1000);
var interval = seconds / 31536000;
if (interval > 1) {
return Math.floor(interval) + " years";
}
interval = seconds / 2592000;
if (interval > 1) {
return Math.floor(interval) + " months";
}
...