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AppInventor如何扫二维码？扫码结果如何与Web进行交互？ - App Inventor 2 ...
Q：请问扫二维码怎么实现？
[hide]A：使用“条码扫描器”组件：https://www.fun123.cn/reference/ ... html#BarcodeScanner
属性“使用外部扫描”设置为假，其他没有啥要注意的。就调用一下扫描方法，就能使用摄像头扫...
兼容主流浏览器的JS复制内容到剪贴板 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...操作（比如鼠标点击）才能访问剪切板，而上述方法只是使用了一个隐藏的swf文件，通过javascript操作flash的剪贴板，用户并没有对swf文件进行真实的操作，因此这个方法也就失效了。
那么如何解决这个“真实操作”的问题呢？...
Read a text file using Node.js?
...what do you mean by "synchronous" in this context?
– Json
Apr 12 '19 at 16:04
1
In Node when some...
How to use jQuery in chrome extension?
...ur chrome-extension project and to the background section of your manifest.json like this :
"background":
{
"scripts": ["thirdParty/jquery-2.0.3.js", "background.js"]
}
If you need jquery in a content_scripts, you have to add it in the manifest too:
"content_scripts":
[
...
How do I implement basic “Long Polling”?
...freeze up. This would better be done checking if the file contains a valid JSON response, and/or keeping a running total of requests-per-minute/second, and pausing appropriately.
If the page errors, it appends the error to the #messages div, waits 15 seconds and then tries again (identical to how w...
Linux下安装项目管理工具Redmine - 开源 & Github - 清泛网 - 专注C/C++及内核技术
...ux下安装项目管理工具Redmine1、Ruby安装Ruby on Rails网站推荐使用1.8.7版。点击(此处)折叠或打开# wget ftp: ftp.ruby-lang.org ...Linux下安装项目管理工具Redmine
1、Ruby安装
Ruby on Rails网站推荐使用1.8.7版。
# wget ftp://ftp.ruby-lang.org...
Save ArrayList to SharedPreferences
...
You can convert it to JSON String and store the string in the SharedPreferences.
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How to read a local text file?
...; console.log(text))
// outputs the content of the text file
reading a json file
fetch('file.json')
.then(response => response.json())
.then(jsonResponse => console.log(jsonResponse))
// outputs a javascript object from the parsed json
Update 30/07/2018 (disclaimer):
Thi...
Google Maps API - Get Coordinates of address
...what you're looking for. You will be able to do geocoding on your server.
JSON Example:
http://maps.google.com/maps/api/geocode/json?address=1600+Amphitheatre+Parkway,+Mountain+View,+CA
XML Example:
http://maps.google.com/maps/api/geocode/xml?address=1600+Amphitheatre+Parkway,+Mountain+Vi...
PostgreSQL database default location on Linux
...ters" (data directories). Of course, each instance would listen on its own TCP/IP port.
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