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App Inventor 2 UrsPahoMqttClient 拓展 - 物联网轻量级MQTT协议 · App Inventor 2 中文网
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NewState：状态的数值（0..4，见上文）
StateString：状态的名称（“Disconnected”等）
建立连接时出错
在尝试建立连接之前，首先会检查客户端的状态是否允许这样做（状态 = Disconnected 或 ConnectionAborted）。...
What is the difference between URI, URL and URN? [duplicate]
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Uniform Resource Identifier (URI) is a string of characters used to identify a name or a resource on the Internet
A URI identifies a resource either by location, or a name, or both. A URI has two specializations known as URL and URN.
A Uniform Resource Locator (...
Why does parseInt yield NaN with Array#map?
...uess octal, which tended to be problematic. It will still guess hex if the string starts with 0x.)
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What are the nuances of scope prototypal / prototypical inheritance in AngularJS?
...g-include can trip you up if you try to bind to a primitive (e.g., number, string, boolean) in the parent scope from inside the child scope. It doesn't work the way most people expect it should work. The child scope gets its own property that hides/shadows the parent property of the same name. Yo...
How to dynamically build a JSON object with Python?
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You build the object before encoding it to a JSON string:
import json
data = {}
data['key'] = 'value'
json_data = json.dumps(data)
JSON is a serialization format, textual data representing a structure. It is not, itself, that structure.
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Rails: Using build with a has_one association in rails
...d line, something like rails g model profile user:references:index address:string bio:text.
– duykhoa
Jun 25 at 13:36
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How to display hidden characters by default (ZERO WIDTH SPACE ie. ​)
...pt to make very well formatted HTML content for migration into WordPress: $string = preg_replace( '/[^\x00-\x7F]/', null, $string ); htmlspecialchars_decode( htmlentities( html_entity_decode( $string ) ) );
– aequalsb
Feb 21 '17 at 13:59
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MySQL: Large VARCHAR vs. TEXT?
... in the page size (16KB and each page must hold at least two rows). If the string is too large for that, it overflows to additional pages. See mysqlperformanceblog.com/2010/02/09/blob-storage-in-innodb for a detailed explanation.
– Bill Karwin
Jan 1 '14 at 21:4...
u'\ufeff' in Python string
... and should be the accepted answer. While this is great insight on why the string is there, most of the people coming here is looking for a straightforward solution and this is it.
– neurino
Feb 12 '19 at 14:00
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How to apply shell command to each line of a command output?
...ot special (every character is taken literally). Disables the end of file string, which is treated like
any other argument. Useful when input items might contain white space, quote marks, or backslashes. The
GNU find -print0 option produces input suitable for this mode.
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