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中文网（自研/维护）拓展 · App Inventor 2 中文网
...tor 2 中文网 MIT同步更新的中文本土化 积木式在线App开发平台！ © 2023 - document.write(new Date().getFullYear()); 跟着学（上海）教育科技有限公司 版权所有，未经书面许可，不得转载或使用 隐私策略和...
Detect Chrome extension first run / update
...ion was unsuspended, the onInstalled event never fired and thus the update script never ran. Worth mentioning for those who run update scripts onInstalled, you might need to listen for a different event in situations where you have requested a new permission.
– Elimn
...
JavaScript Date Object Comparison
...ed, and two objects are never equal to each other. Coerce them to number:
alert( +startDate2 == +startDate3 ); // true
If you want a more explicity conversion to number, use either:
alert( startDate2.getTime() == startDate3.getTime() ); // true
or
alert( Number(startDate2) == Number(startDate3)...
Multiple left-hand assignment with JavaScript
...: v1 = v2 = v3 = 6; They'll still be in local scope. Since David mentioned alerts, this would work as expected (if pre-var'd): alert(v1 = v2 = v3 = 6);
– ShawnFumo
Sep 10 '13 at 20:11
...
使用App Inventor扩展实现多点触控：Scale Detector · App Inventor 2 中文网
...etector.aix 扩展。
请记住，扩展机制仍然不稳定并且正在开发中。 随着系统的发展，你在步骤 (2) 和 (3) 中构建的任何 aia 文件可能需要重新构建。
内容
多点触控演示应用
实现ScaleDetector扩展
App Inventor 没有内置多点触控...
Calculate distance between two points in google maps V3
... overridden with a custom value if necessary.
Make sure you include:
<script type="text/javascript" src="http://maps.google.com/maps/api/js?sensor=false&v=3&libraries=geometry"></script>
in your head section.
The call will be:
google.maps.geometry.spherical.computeDistanceB...
AngularJs: How to check for changes in file input fields?
...posting the file to the server. It uses a directive to achieve this.
<script src="angular.min.js"></script>
<script src="ng-file-upload.js"></script>
<div ng-controller="MyCtrl">
<input type="file" ngf-select="onFileSelect($files)" multiple>
</div>
JS...
LINQ-to-SQL vs stored procedures? [closed]
...ier because everything is compiled into DLL's. No more managing deployment scripts.
Because Linq can support querying anything that implements the IQueryable interface, you will be able to use the same syntax to query XML, Objects and any other datasource without having to learn a new syntax
...
How do I fetch a single model in Backbone?
... @makevoid your I could not make work the example you provide in coffee script or the one in the documentation, the Andrew example works, could you provide and example with foo.url(), it always tell me that there's no function url.
– Roberto Alarcon
Dec 13 '...
Differences between detach(), hide() and remove() - jQuery
...;
<div class="goodevening">good evening</div>
</div>
<script>
$("div.hai").empty();
</script>
This will result in a DOM structure with the Hai text deleted:
<div class="content">
<div class="hai"></div>
<div class="goodevening">good evenin...