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App Inventor 2 图片处理教程 - 缩放、裁剪、存储与转换 · App Inventor 2 中文网
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功能需求
积木块代码
常见问题
Q1: 图片显示变形怎么办？
Q2: 大图片导致OOM（内存溢出）？
Q3: 图片保存到相册后手机相册看不到？
Q4: 如何获取图片的宽高？
总结
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How can I check a C# variable is an empty string “” or null? [duplicate]
...
Very simple and useful. I wish PHP could have something like this
– Andrew Liu
Dec 17 '15 at 5:23
6
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How to make a website secured with https
...or secure coding in mind (here is a good intro: http://www.owasp.org/index.php/Secure_Coding_Principles ), otherwise all you need is a correctly set up SSL certificate.
Is SSL and https one and the same..
Pretty much, yes.
Do I need to apply with someone to get
some license or something....
How do getters and setters work?
I'm from the php world. Could you explain what getters and setters are and could give you some examples?
6 Answers
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Convert JavaScript String to be all lower case?
...triNg".toLowerCase()
Here's the function that behaves exactly the same as PHP's one (for those who are porting PHP code into js)
function strToLower (str) {
return String(str).toLowerCase();
}
share
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How do I get currency exchange rates via an API such as Google Finance? [closed]
... "USDIDR", "USDILS", "USDINR", "USDKRW", "USDMXN", "USDMYR", "USDNZD", "USDPHP", "USDSGD", "USDTHB", "USDZAR", "USDISK")&env=store://datatables.org/alltableswithkeys][1]
Here is the YQL query builder, where you can test a query and copy the url: (NO LONGER AVAILABLE)
http://developer.yahoo.com/y...
手机蓝牙控制台灯：HC-05 开关、无级调光、定时关灯（附 .aia 源码与单片机...
...块调光：节流发送
按行接收单片机回报
常见问题
用到的组件
验证范围
蓝牙台灯：手机通过 HC-05 / HC-06 经典蓝牙控制一盏台灯——开关、拖动滑块无级调光、三档预设、定时关灯，单片机每次执行后回报当前...
Can regular expressions be used to match nested patterns? [duplicate]
...ursive "regular expressions". E.g. see the chapter "Recursive patterns" in php.net/manual/en/regexp.reference.php
– daremon
Sep 25 '08 at 15:26
2
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Zero-pad digits in string
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There's also str_pad
<?php
$input = "Alien";
echo str_pad($input, 10); // produces "Alien "
echo str_pad($input, 10, "-=", STR_PAD_LEFT); // produces "-=-=-Alien"
echo str_pad($input, 10, "_", STR_PAD_BOTH); // produces ...
Remove portion of a string after a certain character
... just wondering how I could remove everything after a certain substring in PHP
15 Answers
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