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App Inventor 2 OCR 图片文字识别全方案总结 · App Inventor 2 中文网
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App Inventor 2 TableView 拓展：TableView 拓展：数据表格视图，表格展示...
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App Inventor 2 TextboxUtil 扩展：消除输入框焦点（光标） · App Inventor 2 中文网
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App Inventor 2 SliderVertical 扩展：垂直的滑动条 · App Inventor 2 中文网
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What is a “web service” in plain English?
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Simplified, non-technical explanation:
A web serivce allows a PROGRAM to talk to a web page, instead of using your browser to open a web page.
Example:
I can go to maps.google.com, and type in my home address, and see a map of where I live in my browser.
But what if you were...
Tools for JPEG optimization? [closed]
Do you know of any tools (preferrably command-line) to automatically and losslessly optimize JPEGs that I could integrate into our build environment? For PNGs I'm currently using PNGOUT , and it generally saves around 40% bandwidth/image size.
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Add new value to an existing array in JavaScript [duplicate]
In PHP, I'd do something like:
8 Answers
8
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performing HTTP requests with cURL (using PROXY)
... when I run this command: curl -x, --proxy 122.72.2.200:80 mysite.com/test.php?id=1
– user873286
Feb 27 '12 at 22:52
63
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Javascript: formatting a rounded number to N decimals
...9999998.toFixed(4) correctly returns 1.0245.
– Matt Ball
Mar 13 '12 at 14:40
3
@MarkTomlin: Then ...
How to check if hex color is “too black”?
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You have to extract the three RGB components individually, and then use a standard formula to convert the resulting RGB values into their perceived brightness.
Assuming a six character colour:
var c = c.substring(1); // strip #
var rgb = parseInt(c, 16); // convert rrg...