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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...
Checking network connection
...client as httplib
def have_internet():
conn = httplib.HTTPConnection("www.google.com", timeout=5)
try:
conn.request("HEAD", "/")
conn.close()
return True
except:
conn.close()
return False
...
What does 'foo' really mean?
...nternet specifications, protocols, procedures, and events". Source: http://www.livinginternet.com
– ZygD
Nov 29 '15 at 10:11
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How to simulate target=“_blank” in JavaScript
...
<script>
window.open('http://www.example.com?ReportID=1', '_blank');
</script>
The second parameter is optional and is the name of the target window.
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`Apache` `localhost/~username/` not working
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This is because the default webserver user which runs httpd is known as _www, which will not be the user in your local account. If your machine is only in use by you and the webserver will run only under your account then you can change the user.
To Find Your User and Group
In the Terminal use th...
Linking to an external URL in Javadoc?
...bol (<) as the first character.
For example : @see <a href="http://www.google.com">Google</a>
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Refresh a page using JavaScript or HTML [duplicate]
... the versionnumber of the page as a string (ajax) at loading. for example: www.yoursite.com/page/about?getVer=1&__[date]
Compare it to the stored versionnumber (stored in cookie or localStorage) if user has visited the page once, otherwise store it directly.
If version is not the same as local v...
AngularJS performs an OPTIONS HTTP request for a cross-origin resource
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It is very hard to provide a generic solution that would work for all the WWW servers as setup will vary depending on the server itself and HTTP verbs that you intend to support. I would encourage you to get over this excellent article (http://www.html5rocks.com/en/tutorials/cors/) that has much mo...
Express.js req.body undefined
...n/json parser
var jsonParser = bodyParser.json()
// create application/x-www-form-urlencoded parser
var urlencodedParser = bodyParser.urlencoded({ extended: false })
// POST /login gets urlencoded bodies
app.post('/login', urlencodedParser, function (req, res) {
res.send('welcome, ' + req.body...
Passing arguments to “make run”
...make. and var=arg as a variable assignment.
for more details see: https://www.gnu.org/software/make/manual/html_node/Goals.html#Goals
for the terminology see: https://www.gnu.org/software/make/manual/html_node/Rule-Introduction.html#Rule-Introduction
about the variable assignment method and why...