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App Inventor 2开发计步器与定位器 - App Inventor 2 中文网 - 清泛IT论坛，有思想、有深度
...；
3.通过编程实践，感受和体验利用手机自身硬件开发实用的手机应用程序。 【项目范例】
1. 情境
现在的手机都已经具有计步器及位置传感器等各种硬件传感器，利用这些传感器，我们就可以自制一个适合...
What is the JavaScript convention for no operation?
...on is:
none of your suggestions, instead do:
var a = 2;
if (a === 1)
alert(1)
// else do nothing!
then the code is easily understandable, readable and as much efficient as it can get.
Why make it more difficult, when it can be simple?
edit:
So then, does a "no-operation" command basica...
How do I iterate over a JSON structure? [duplicate]
...
The answer should have been given in JavaScript, not JQuery.
– Wayne Hartman
May 31 '13 at 3:10
22
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How to measure time taken by a function to execute
...
Don't use Date(). Read below.
Use performance.now():
<script>
var a = performance.now();
alert('do something...');
var b = performance.now();
alert('It took ' + (b - a) + ' ms.');
</script>
It works on:
IE 10 ++
FireFox 15 ++
Chrome 24 ++
Safari 8 ++
Opera 15 ++
A...
How do I integrate Ajax with Django applications?
...ng it would as if you visited it. Only this time, you have it inside a JavaScript function and you can deal with it however you'd like. Let's look at a simple use case:
$.ajax({
url: '127.0.0.1:8000/hello',
type: 'get', // This is the default though, you don't actually need to always mentio...
How can I determine the current line number in JavaScript?
Does JavaScript have a mechanism for determining the line number of the currently executing statement (and if so, what is it)?
...
What is ECMAScript?
In Visual Studio when I am setting my script type to JavaScript this comes up as an option in intellisense.
6 Answers
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iPhone App 开发第一步：从零到真机调试HelloWorld - 更多技术 - 清泛网 - ...
iPhone App 开发第一步：从零到真机调试HelloWorldiCc原创，转载请注明出处！ 最近才开始研究iPhone开发，由于没有Mac，采用的是AMD CPU + Win7 + VMWare之后安装Mac OS X Snow Le... iCc原创，转载请注明出处！
最近才开始研究iPhone开发，由于...
jQuery: Return data after ajax call success [duplicate]
I have something like this, where it is a simple call to a script that gives me back a value, a string..
5 Answers
...
How to have click event ONLY fire on parent DIV, not children?
...ellow;
}
span {
background: blue; color: white; padding: 8px;
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>
<div class='foobar'> .foobar (alert)
<span>child (no alert)</span>
</div>
...