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生物识别使用指导 · App Inventor 2 中文网
...，将同名事件的处理合并到一个事件积木中。
when 按钮1.Click() {
if (生物识别1.IsAvailable()) {
生物识别1.Authenticate("查看隐私内容", "请验证指纹或人脸")
} else {
标签1.Text = "本机不支持指纹或人脸，请用密码登录"
}
}
when ...
How do I check in SQLite whether a table exists?
...
1045
I missed that FAQ entry.
Anyway, for future reference, the complete query is:
SELECT name F...
NSUserDefaults not cleared after app uninstall on simulator
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169
I think this is due to a bug in the iOS8 Beta Simulator.
The expected behavior is that when t...
What are the “standard unambiguous date” formats for string-to-date conversion in R?
...-'NA' element,
and give an error if neither works.
as.Date("01 Jan 2000") yields an error because the format isn't one of the two listed above. as.Date("01/01/2000") yields an incorrect answer because the date isn't in one of the two formats listed above.
I take "standard unambiguou...
How to get the tag HTML with JavaScript / jQuery?
...
313
The simplest way to get the html element natively is:
document.documentElement
Here's the re...
libxml/tree.h no such file or directory
...
214
Follow the directions here, under "Setting up your project file."
Setting up your project f...
Heroku/devise - Missing host to link to! Please provide :host parameter or set default_url_options[:
...
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edited Jul 7 '11 at 21:58
sarnold
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How does a Java HashMap handle different objects with the same hash code?
...
14 Answers
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How do you remove a Cookie in a Java Servlet
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139
The MaxAge of -1 signals that you want the cookie to persist for the duration of the session. ...