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Redis消息通知系统的实现 - 大数据 & AI - 清泛网 - 专注C/C++及内核技术

...,都会小很多,所以如果只处理登录用户的话,那么至少内存消耗上是相当划算的,至于未登录用户,可以推迟到用户下次登录时再处理,如果用户一直不登录,就一了百了了。 队列 当大量用户同时登录的时候,如果全部...
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Why is using onClick() in HTML a bad practice?

... clear and effective - e.g. in angular template usually people write: <button (click)="someAction()">Click Me</button> In raw js/html the equivalent of this will be <button onclick="someAction()">Click Me</button> The difference is that in raw js onclick event is run i...
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What's the shebang/hashbang (#!) in Facebook and new Twitter URLs for?

...ookmarkable (as suggested by a comment on that answer) or support the back button without reloading the entire page from the server. In order to support bookmarking and the back button, you need to change the URL. However, if you change the page portion (with something like window.location = 'http:...
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Android dismiss keyboard

How do I dismiss the keyboard when a button is pressed? 9 Answers 9 ...
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Expand/collapse section in UITableView in iOS

...erInSection:(NSInteger)section and return a custom UIView which includes a button (typically the same size as the header view itself). By subclassing UIView and using that for the header view (as this sample does), you can easily store additional data such as the section number. ...
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Google Maps V3: How to disable “street view”?

...en answer and say that if you want to remove the zoom controls (plus-minus buttons) too, then change streetViewControl: false, with disableDefaultUI: true, It was more useful for a mobile touchscreen, since you can zoom in with two fingers. ...
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How to bind RadioButtons to an enum?

..." /> </Grid.Resources> <StackPanel > <RadioButton IsChecked="{Binding Path=VeryLovelyEnum, Converter={StaticResource enumBooleanConverter}, ConverterParameter=FirstSelection}">first selection</RadioButton> <RadioButton IsChecked="{Binding Path=VeryLo...
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how to implement a pop up dialog box in iOS

... delegate:nil cancelButtonTitle:@"OK" otherButtonTitles:nil]; [alert show]; [alert release]; If you want to do something more fancy, say display a custom UI in your UIAlertView, you can subclass UIAlertVie...
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How do I use installed packages in PyCharm?

...ess configure interpreter, and navigate to the "Paths" tab. Press the + button in the Paths area. You can put the path to the module you'd like it to recognize. But I don't know the path.. Open the python interpreter where you can import the module. >> import gnuradio >> gnuradio...
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How to format numbers as currency string?

...pe="text" placeholder="Cash amount" /></label> <br /> <button id="b">Get Output</button> <p id="x">(press button to get output)</p> Use it like so: (123456789.12345).formatMoney(2, ".", ","); If you're always going to use '.' and ',', you can leave...