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App Inventor 2 低功耗蓝牙 BlueToothLE 拓展 · App Inventor 2 中文网
...试具有响应能力的写入特征UUID。
CharacteristicByIndex – 从已连接设备支持的特征列表中返回指定索引的特征UUID，索引从 1 开始。
参数:
index (number) —
特征的索引，必须介于 1 和特征列表的长度之间...
Normal arguments vs. keyword arguments
How are "keyword arguments" different from regular arguments? Can't all arguments be passed as name=value instead of using positional syntax?
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Using .gitignore to ignore everything but specific directories
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Here's how I did it - you essentially have to walk up the paths, you can't wildcard more than one level in any direction:
# Ignore everything:
*
# Except for the themes directories:
!wordpress/
!wordpress/*/
!wordpress/*/wp-content/
!wordpress/*/wp-conten...
jQuery, simple polling example
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setinterval would make an ajax call every 5 seconds no matter what. the way have written it (which i believe is good practice) will wait for the results THEN make another ajax request 5 seconds later. there are times i would use setinterval, but this is not...
How to easily truncate an array with JavaScript?
... I saw this in a code... But it's the best way (if you are truncating from index 0) davidwalsh.name/empty-array
– kumarharsh
Aug 22 '13 at 13:52
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How to remove a column from an existing table?
...requisites to dropping columns. The columns dropped can't be:
Used by an Index
Used by CHECK, FOREIGN KEY, UNIQUE, or PRIMARY KEY constraints
Associated with a DEFAULT
Bound to a rule
If any of the above are true you need to drop those associations first.
Also, it should be noted, that dropping...
How to split a string at the first `/` (slash) and surround part of it in a ``?
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Instead of using substring with a fixed index, you'd better use replace :
$("#date").html(function(t){
return t.replace(/^([^\/]*\/)/, '<span>$1</span><br>')
});
One advantage is that it would still work if the first / is at a different pos...
how to compare two elements in jquery [duplicate]
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@mikeycgto using array index notation is the same as .get(), not .eq(). they are very different.
– Kevin B
Feb 5 '13 at 15:19
2
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mysql update column with value from another table
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@frijj2k would this still be slow if .name is indexed on both tables?
– Steverino
Jan 6 '17 at 17:17
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Java ArrayList copy
...nation.size() is at least as big as source.size(), and then copy the range index-by-index using the set(int,E) method. The method doesn't add new elements to the destination. Refer to the source code if it's not clear enough from the Javadoc.
– Radiodef
Aug 3 '...