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【持续更新】App Inventor 2 中文拓展一览 - App Inventor 2 中文网 - 清泛...
...s本文档描述您在使用App Inventor 2构建应用程序时所能用到的拓展，以打造界面更加酷炫、功能更加强大的App。更多拓展请移步至《原版最全拓展一览》。【实用小技巧】从 aia项目文 本文档描述您在使用App Inventor 2构建应用程序...
怎么从MQTT Topic接收的信息中解析出，然后查找想用的键值，让键值中的数据...
怎么将MQTT中接收的信息 Topic中接收的信息 解析成JSON 然后查找对应的键值 将数据显示到文本上https://bbs.tsingfun.com/thread-1813-1-1.html
把json换成你的topic就行了。
遇到问题的话，每一步的变量都打印出来看看，找到哪一步的问...
Subtract days from a date in JavaScript
Does anybody know of an easy way of taking a date (e.g. Today) and going back X days?
32 Answers
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Why is using “for…in” for array iteration a bad idea?
I've been told not to use for...in with arrays in JavaScript. Why not?
27 Answers
27...
jQuery scroll to element
... to a particular element, you don't require some jQuery function for this. Javascript has got your case covered:
https://developer.mozilla.org/en-US/docs/Web/API/element.scrollIntoView
So all you need to do is: $("selector").get(0).scrollIntoView();
.get(0) is used because we want to retrieve t...
Check a radio button with javascript
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I was able to select (check) a radio input button by using this Javascript code in Firefox 72, within a Web Extension option page to LOAD the value:
var reloadItem = browser.storage.sync.get('reload_mode');
reloadItem.then((response) => {
if (response["reload_mode"] == "Periodic")...
What is Rack middleware?
...erfectly rendered. That's was easy, right?
Let's add a whole directory of javascript files by creating some javascript files under /javascripts and adding the following to the config.ru:
map '/javascripts' do
run Rack::Directory.new "javascripts"
end
Restart the server and visit http://localho...
Determine which element the mouse pointer is on top of in JavaScript
I want a function that tells me which element the mouse cursor is over.
13 Answers
13
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Is it possible to make an HTML anchor tag not clickable/linkable using CSS?
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That isn't too easy to do with CSS, as it's not a behavioral language (ie JavaScript), the only easy way would be to use a JavaScript OnClick Event on your anchor and to return it as false, this is probably the shortest code you could use for that:
<a href="page.html" onclick="return false">...
Is it possible to implement dynamic getters/setters in JavaScript?
...swer from 2011):
This changed as of the ES2015 (aka "ES6") specification: JavaScript now has proxies. Proxies let you create objects that are true proxies for (facades on) other objects. Here's a simple example that turns any property values that are strings to all caps on retrieval:
"use stri...