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Why would a JavaScript variable start with a dollar sign? [duplicate]
I quite often see JavaScript with variables that start with a dollar sign. When/why would you choose to prefix a variable in this way?
...
Is it possible to register a http+domain-based URL Scheme for iPhone apps, like YouTube and Maps?
... I've played with but found a little clunky was to do the following in Javascript:
setTimeout(function() {
window.location = "http://itunes.com/apps/yourappname";
}, 25);
// If "custom-uri://" is registered the app will launch immediately and your
// timer won't fire. If it's not set, you'll get...
JavaScript for…in vs for
...hen using this function.
Example:
$(['a','b','c']).each(function() {
alert(this);
});
//Outputs "a" then "b" then "c"
The downside of using this is that if you're doing some non UI logic, your functions will be less portable to other frameworks. The each() function is probably best reserved ...
jQuery find events handlers registered with an object
...nction(i, h) {
return h + text + "<br />";
});
}
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<div id="el">Test</div>
<code>
<span id="output"></span>
</code>
...
GestureDetect 手势检测扩展：识别滑动、点击和长按手势 · App Inventor 2 中文网
...无特殊权限要求
致谢
特别感谢以下开发者对扩展开发的支持：
Mohamed_Tamer - 技术指导
ADDYLIN - 开发支持
原文链接
原版文档：
MIT App Inventor Community - GestureDetect 扩展发布帖
MIT App Inven...
What is context in _.each(list, iterator, [context])?
...ach(['Hello', 'World!'], function(word){
console.log(word);
});
<script src="https://cdnjs.cloudflare.com/ajax/libs/underscore.js/1.8.3/underscore-min.js"></script>
Here's simple example that could use _.each:
function basket() {
this.items = [];
this.addItem...
Android Min SDK Version vs. Target SDK Version
...OMB
? com.android.internal.R.style.Theme_Holo_Light_Dialog_Alert
: com.android.internal.R.style.Theme_Dialog_Alert,
callBack, year, monthOfYear, dayOfMonth, yearOptional);
}
As you can see, the framework gets current targetSDKversion and set different theme....
How to loop through array in jQuery?
...e odds are you'd have other problems; details).
ES5's forEach:
As of ECMAScript5, arrays have a forEach function on them which makes it easy to loop through the array:
substr.forEach(function(item) {
// do something with `item`
});
Link to docs
(Note: There are lots of other functions, not...
使用Activity启动器组件 · App Inventor 2 中文网
...与 App Inventor 应用程序一起使用的外部应用程序的 Android 开发人员提供的技术信息
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使用Activity启动器组件
Activity Starter 组件允许你通过让一个应用程序启动其他应用程序来组合应用程序。 这是通过利用其他应用程...
How can I bind to the change event of a textarea in jQuery?
... oldVal = currentVal;
//action to be performed on textarea changed
alert("changed!");
});
jsFiddle Demo
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