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StatusbarTools 状态栏工具扩展 · App Inventor 2 中文网
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故障排除
常见问题
Q: 状态栏颜色设置无效？
A: 检查应用是否具有必要的权限，某些设备需要额外的设置。
Q: 图标颜色不改变？
A: 确保使用正确的方法调用（IconDark/IconLight），检查设备是...
Can anyone explain what JSONP is, in layman terms? [duplicate]
...ssible
(i.e. your server or
API supports it, and the
browser support is adequate),
as JSONP has inherent security risks.
JSONP (JSON with Padding) is a method commonly used to
bypass the cross-domain policies in web browsers. (You are not allowed to make AJAX requests to a web page perceived to b...
Stop all active ajax requests in jQuery
I have a problem, when submitting a form all active ajax request fail, and that triggers error event.
16 Answers
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Download file from web in Python 3
...contents of a web page into a variable, just read the response of urllib.request.urlopen:
import urllib.request
...
url = 'http://example.com/'
response = urllib.request.urlopen(url)
data = response.read() # a `bytes` object
text = data.decode('utf-8') # a `str`; this step can't be used if data...
TaifunWiFi 拓展：WiFi Manager WiFi管理器扩展 · App Inventor 2 中文网
...置权限是否授予()
检查应用是否被授予位置权限。
RequestLocationPermission 请求位置权限()
请求位置权限。
AddNetworkSuggestion 添加网络建议(SSID,密码)
添加网络建议（Network Suggestion API）。
RemoveNetworkSuggestion 移除网络建议(S...
PostgreSQL: Show tables in PostgreSQL
What's the equivalent to show tables (from MySQL) in PostgreSQL?
24 Answers
24
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How to test an Internet connection with bash?
...
Without ping
#!/bin/bash
wget -q --spider http://google.com
if [ $? -eq 0 ]; then
echo "Online"
else
echo "Offline"
fi
-q : Silence mode
--spider : don't get, just check page availability
$? : shell return code
0 : shell "All OK" code
Withou...
How do I determine file encoding in OS X?
...ans that the file has extended file attributes associated with it. You can query them using the getxattr() function.
There's no definite way to detect the encoding of a file. Read this answer, it explains why.
There's a command line tool, enca, that attempts to guess the encoding. You might want t...
Select N random elements from a List in C#
I need a quick algorithm to select 5 random elements from a generic list. For example, I'd like to get 5 random elements from a List<string> .
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Wget output document and headers to STDOUT
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Try the following, no extra headers
wget -qO- www.google.com
Note the trailing -. This is part of the normal command argument for -O to cat out to a file, but since we don't use > to direct to a file, it goes out to the shell. You can use -qO- or -qO -.
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