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App Inventor 计时器在界面设计中哪里?如何确定计时器有没有执行? - Ap...

...定执行没? 答:在“传感器”下面: 也可在组件搜索框中进行搜索: 计时器怎么启动? 默认计时器是自动启用,也可程序控制它“启用计时”和“不启用计时”。 怎么确定执行没? 定一个数字全局变量,计时...
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how to use ng-option to set default value of select element

... your array of objects are complex like: $scope.friends = [{ name: John , uuid: 1234}, {name: Joe, uuid, 5678}]; And your current model was set to something like: $scope.user.friend = {name:John, uuid: 1234}; It helped to use the track by function on uuid (or any unique field), as long as the ...
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移动前端开发之viewport深入理解 - 更多技术 - 清泛网 - 专注C/C++及内核技术

...,就是无论你给layout viewpor设置宽度是多少,而又没有指定初始缩放值话,那么iphone和ipad会自动计算initial-scale这个值,以保证当前layout viewport宽度在缩放后就是浏览器可视区域宽度,也就是说不会出现横向滚动条。...
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How to speed up insertion performance in PostgreSQL

... If you happend to insert colums with UUIDs (which is not exactly your case) and to add to @Dennis answer (I can't comment yet), be advise than using gen_random_uuid() (requires PG 9.4 and pgcrypto module) is (a lot) faster than uuid_generate_v4() =# explain anal...
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Rails 4: List of available datatypes

... For Postgres there is additionally a uuid type which can be used as normal field like t.uuid :name... or as primary key like create_table :users, id: :uuid do... or e.g. t.primary_key :id, :uuid, :default => 'uuid_generate_v1()' – TNT ...
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项目管理实践【三】每日构建【Daily Build Using CruiseControl.NET and MS...

... <buildArgs>/p:configuration=debug</buildArgs> <!--指定日志记录模块--> <!--我这里CruiseControl.NET 安装在D盘,你们使用时候,改成自己安装路径即可--> <logger>ThoughtWorks.CruiseControl.MsBuild.XmlLogger,D:\Program Fi...
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Homebrew作者解不出面试题,被Google拒绝 - 创意 - 清泛网 - 专注C/C++及内核技术

...mebrew是Mac上一套流行软件包管理工具,可以通过命令行搜索、安装、卸载软件包。近日,其作者在进入Google面试中,因解不出一个二叉 Homebrew是Mac上一套流行软件包管理工具,可以通过命令行搜索、安装、卸载软件包。...
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CentOS+Nginx+PHP+MySQL详细配置(图解) - 更多技术 - 清泛网 - 专注C/C++及内核技术

...果是按着上面笔者步骤一步步走下来,安装Nginx时只需指定Nginx安装路径即可 #tar zxvf nginx-0.8.24.tar.gz #cd nginx-0.8.24 #./configure --prefix=/usr/local/nginx //此处在本环节只需指定一个路径 #make && make install #/usr/local/nginx/sbin/nginx ...
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Android应用开发性能优化完全分析 - 更多技术 - 清泛网 - 专注C/C++及内核技术

...可,哎呀,关于这个工具使用我是真不想说了,自己搜索吧,实在简单、传统不行了。 PS:这是开发中使用频率非常高一个工具之一,麻烦务必掌握其核心使用技巧,虽然Android Studio已经实现了部分功能,但是真很难...
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Mocking static methods with Mockito

...ception occurred while fetching localhost address", e); return UUID.randomUUID().toString(); } } } My test class: @RunWith(PowerMockRunner.class) @PrepareForTest(SmokeRouteBuilder.class) public class SmokeRouteBuilderTest { @Test public void testSmokeMessageId_exce...