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做了个购物清单App后，我才真正搞懂App Inventor 2的变量 - App应用开发 - ...
...t;"变量作用域混乱"这些问题反复折磨。
干脆用一个购物清单App的实际开发过程，把变量那点事彻底讲透。
需求分析
侄子想要一个简单的购物清单：
- 能添加商品名称和数量
- 能查看当前清单
- 能删除已购买的...
App Inventor 2 UrsAI2UDP 拓展 - UDP广播通信协议 · App Inventor 2 中文网
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原作者开发动机
对于一个项目，应该开发一个与 ESP8266（项目）通信的 Android 应用程序。为了轻松开发应用程序，选择了 MIT App Inventor 2。
项目中可用的 ESP8266 设备的 IP 地址不应固定。应用程...
Importing modules from parent folder
... edited Jan 12 '17 at 18:30
MERose
2,79255 gold badges3535 silver badges6060 bronze badges
answered Apr 3 '09 at 14:09
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How can I install Apache Ant on Mac OS X?
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Ant is already installed on some older versions of Mac OS X, so you should run ant -version to test if it is installed before attempting to install it.
If it is not already installed, then your best bet is to install Homebrew (brew install ant) or MacPorts (sudo port install ap...
Installing libv8 gem on OS X 10.9+
I'm trying to install libv8 3.16.14.3 but getting an error on OSX Mavericks using latest stable rvm and ruby-1.9.3-p125.
20...
php中json_decode()和json_encode()的使用方法 - 更多技术 - 清泛网 - 专注C/C++及内核技术
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说明：
mixed json_decode ( string $json [, bool $assoc ] )
接受一个 JSON 格式的字符串并且把它转换为 PHP 变量
参数：
json
待解码的 json string 格式的字符串。
assoc
当该参数为 TRUE 时，将返回 array 而非 object 。
返回值：
Retu...
Locate Git installation folder on Mac OS X
I'm just curious, Where Git get installed (via DMG) on Mac OS X file system?
11 Answers
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How to terminate a python subprocess launched with shell=True
...ted to all of the child processes of this group.
Here's the code:
import os
import signal
import subprocess
# The os.setsid() is passed in the argument preexec_fn so
# it's run after the fork() and before exec() to run the shell.
pro = subprocess.Popen(cmd, stdout=subprocess.PIPE,
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Find the files existing in one directory but not in the other [closed]
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Explanation:
diff -r dir1 dir2 shows which files are only in dir1 and those only in dir2 and also the changes of the files present in both directories if any.
diff -r dir1 dir2 | grep dir1 shows which files are only in dir1
awk to print only filename.
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Simulating tremor (from e.g. Parkinson's Disease) with the mouse on a webpage?
... the same as a shaking hand. With random movement the pointer can drift across the screen. With a shaking hand the pointer is going to vibrate around a central point.
– zzzzBov
Aug 12 '14 at 14:53
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