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App Inventor 2 经典蓝牙(SPP) 硬件接入：hc05 · App Inventor 2 中文网
... 它的波特率是：38400，而非默认的9600。
上电之前按下硬件上的按钮，则进入AT模式，红灯慢闪；不按则默认进入透传模式，红灯快闪，等待配对。
STATE引脚在蓝牙连接成功后是高电平，否则低电平。
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How to get the raw value an field?
...re, and doesn't work. Especially when the users presses Delete, Backspace, Ctrl+X, Ctrl+V, Right-click-cut, Right-click-paste.
– Ian Boyd
Oct 31 '13 at 12:30
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Code snippet or shortcut to create a constructor in Visual Studio
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If you want to see the list of all available snippets:
Press Ctrl + K and then X.
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How do you launch the JavaScript debugger in Google Chrome?
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Windows: CTRL-SHIFT-J OR F12
Mac: ⌥-⌘-J
Also available through the wrench menu (Tools > JavaScript Console):
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IntelliJ show JavaDocs tooltip on mouse over
...tly highlighted in the lookup list. If this check box is not selected, use Ctrl+Q to show quick documentation for the element at caret.
Quick documentation window will automatically pop up with the specified delay in those cases only, when code completion has been invoked explicitly. For the automa...
Check image width and height before upload with Javascript
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function validateimg(ctrl) {
var fileUpload = $("#txtPostImg")[0];
var regex = new RegExp("([a-zA-Z0-9\s_\\.\-:])+(.jpg|.png|.gif)$");
if (regex.test(fileUpload.value.toLowerCase())) {
if (typeof (fileUploa...
How can I save a screenshot directly to a file in Windows? [closed]
...P, one can press Alt-PrintScreen to copy an image of the active window, or Ctrl-PrintScreen to copy an image of the full desktop.
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How can I run just the statement my cursor is on in SQL Server Management Studio?
As a long time Toad for Oracle user, I have gotten used to hitting Ctrl+Enter and having just the statement under the cursor be executed.
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Showing line numbers in IPython/Jupyter Notebooks
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CTRL - ML toggles line numbers in the CodeMirror area. See the QuickHelp for other keyboard shortcuts.
In more details CTRL - M (or ESC) bring you to command mode, then pressing the L keys should toggle the visibility of cu...
How to duplicate a whole line in Vim?
How do I duplicate a whole line in Vim in a similar way to Ctrl + D in IntelliJ IDEA/ Resharper or Ctrl + Alt + ↑ / ↓ in Eclipse ?
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