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++someVariable vs. someVariable++ in JavaScript
...+ evaluates the value, then increments and stores it.
var n = 0, m = 0;
alert(n++); /* Shows 0, then stores n = 1 */
alert(++m); /* Shows 1, then stores m = 1 */
Note that there are slight performance benefits to using ++x where possible, because you read the variable, modify it, then evaluate ...
How does the “this” keyword work?
...he this keyword is and how it is correctly (and incorrectly) used in JavaScript on the Stack Overflow site.
22 Answers
...
What is JSONP, and why was it created?
...n most of browserland.
The one item that bypasses this limitation is <script> tags. When you use a script tag, the domain limitation is ignored, but under normal circumstances, you can't really do anything with the results, the script just gets evaluated.
Enter JSONP. When you make your req...
How to tell if a tag failed to load
I'm dynamically adding <script> tags to a page's <head> , and I'd like to be able to tell whether the loading failed in some way -- a 404, a script error in the loaded script, whatever.
...
Detect when an HTML5 video finishes
...src="video.ogv" id="myVideo">
video not supported
</video>
<script type='text/javascript'>
document.getElementById('myVideo').addEventListener('ended',myHandler,false);
function myHandler(e) {
// What you want to do after the event
}
</script>
...
Check if user is using IE
...
Use below JavaScript method :
function msieversion()
{
var ua = window.navigator.userAgent;
var msie = ua.indexOf("MSIE ");
if (msie > 0) // If Internet Explorer, return version number
{
alert(parseInt(ua.sub...
How can I render inline JavaScript with Jade / Pug?
I'm trying to get JavaScript to render on my page using Jade (http://jade-lang.com/)
8 Answers
...
jQuery .data() does not work, but .attr() does
... length of the selectors after they've been set, jsbin.com/acegef/edit#javascript,html,live
– Ian Davis
Jan 3 '12 at 20:34
9
...
jQuery get value of select onChange
...
$('select').on('change', function() {
alert( this.value );
});
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<select>
<option value="1">One</option>
<option value="2">Two</option>
</select&g...
win7 安装项目管理工具redmine2.5.1 - 开源 & Github - 清泛网 - 专注C/C++及内核技术
...填写zh即可。
七、测试
在redmine的目录中执行：ruby script/rails server webrick -e production
E:\work\redmine-2.5.1>ruby script/rails server webrick -e production
==> Booting WEBrick
==> Rails 3.2.17 application starting in production on http://0.0.0.0:...