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App Inventor 2 拓展参考文档 · App Inventor 2 中文网
...平台接入】 AliSms 拓展：阿里云短信平台接入，短信验证码
【设备信息】 PhoneInfo 拓展：获取手机等设备软硬件、版本等相关信息
【数据库】 SQLite 拓展：超流行兼容主流SQL语法的迷你本地数据库引擎
【Web浏览器】CustomWebVie...
How to loop through all but the last item of a list?
... easiest way to compare the sequence item with the following:
for i, j in zip(a, a[1:]):
# compare i (the current) to j (the following)
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SQL query for finding records where count > 1
... named PAYMENT . Within this table I have a user ID, an account number, a ZIP code and a date. I would like to find all records for all users that have more than one payment per day with the same account number.
...
Resource interpreted as Document but transferred with MIME type application/zip
...d attribute in your <a> tag.
<a href="http://example.com/archive.zip" download>Export</a>
https://developer.mozilla.org/en-US/docs/Web/HTML/Element/a#attr-download
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SQL Server Installation - What is the Installation Media Folder?
...
If you've downloaded SQL from the Microsoft site, rename the file to a zip file and then you can extract the files inside to a folder, then choose that one when you "Browse for SQL server Installation Media"
SQLEXPRADV_x64_ENU.exe > SQLEXPRADV_x64_ENU.zip
7zip will open it (standard Windows...
string sanitizer for filename
...ive characters
$filename = preg_replace(array(
// "file name.zip" becomes "file-name.zip"
'/ +/',
// "file___name.zip" becomes "file-name.zip"
'/_+/',
// "file---name.zip" becomes "file-name.zip"
'/-+/'
), '-', $filename);
$filename = pre...
Compression/Decompression string with C#
...) != 0) {
dest.Write(bytes, 0, cnt);
}
}
public static byte[] Zip(string str) {
var bytes = Encoding.UTF8.GetBytes(str);
using (var msi = new MemoryStream(bytes))
using (var mso = new MemoryStream()) {
using (var gs = new GZipStream(mso, CompressionMode.Compress)) {...
Extract source code from .jar file
... This is equivalent to renaming filename.jar to filename.jar.zip and then just unzipping it.
– Mathias Bynens
Mar 5 '14 at 9:16
28
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App Inventor 2 数学积木的9个隐藏用法：随机种子、位运算、取整陷阱，踩中...
...twise or（含 Inclusive 和 Exclusive 两种），配合一个预设的掩码列表 [1, 2, 4, 8, 16, ...] 就能实现任意位的读写。
把二进制第 N 位改为 1：用原值和掩码做按位或。
把第 N 位改为 0：用原值和掩码取反后做按位与。
这套方法在蓝...
任何组件块 · App Inventor 2 中文网
...念是“不要重复自己”（或 DRY）。与其制作大量重复代码，例如通过复制和粘贴，不如使用称为“任何组件”块的特殊块。
“任何组件”块到底是什么？
每一个组件块，比如设置 按钮1.文本 为，都包含三个部分：
（1）被改...