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题目描述 Bessie and her sister Elsie graze in different fields during the day, and in the evening they both want to walk back to the barn to rest. Being clever bovines, they come up with a plan to minimize the total amount of energy they both spend while walking. Bessie spends B units of energy when walking from a field to an adjacent field, and Elsie spends E units of energy when she walks to an adjacent field. However, if Bessie and Elsie are together in the same field, Bessie can carry Elsie on her shoulders and both can move to an adjacent field while spending only P units of energy (where P

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: I want to do a round corner ImageView . But I want it have background color (e.g., #000 ). With current solutions (either build an extended round corner view or paint a round corner bitmap) the background property will spoil the effect, as the view will be in a black rectangle (see the below image). Is it possible to realize such a view that the background zone is also round cornered? PS, why I want a background color: I allow users to upload non-square images but my image view zone is square, so I want a color to "align" them (see the below

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: I'm trying to change the background color using this code: data.getItemMetadata = function (index) { if (index === 5) { return {cssClasses: "Unverified"}; } } It works perfect as long as the index is even. but with odd indexes it has no effect on the background color (it has effect on the font style). I suspect it has something to do with the zebra effect? (I don't know how to disable that) Thanks. 回答1: Your Unverified CSS class gets applied, but has no effect because it's specificity is lower than what is defined in slick-default-theme.css

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: EDIT2 - Rewrote the question I want to do some web service communication in the background. I am using Sudzc as the handler of HTTPRequests and it works like this: SudzcWS *service = [[SudzcWS alloc] init]; [service sendOrders:self withXML:@"my xml here" action:@selector(handleOrderSending:)]; [service release]; It sends some XML to the webservice, and the response (in this one, a Boolean) is handled in the selector specified: - (void)handleOrderSending:(id)value { //some controls if ([value boolValue] == YES) { //my stuff } } When I tried

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: I want to run the front camera of a device from a background service, getting the captured frames by the camera in the background service using the callback that's called whenever a new frame is captured by the camera (eg, onPreviewFrame ), and apply some real time processing on the obtained frames. After searching I understand that there are two ways to run the camera in the background: 1- setting a SurfaceView with size 1 X 1. 2- Using SurfaceTexture (This does not require any view which seems more efficient.) I tried both ways, I could

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: The HTML below: some title here some content here some title here some content here some title here some content here When mouseover the content of div then it's backgroundColor and the h2 (inside this div) backgroundColor change (just like the CSS :hover) I know this can use CSS (:hover) to do this in modern browser but IE6 does't work. How to use JavaScript (not jQuery or other JS framework) to do this? Edit:how to change the h2 backgroundColor too 回答1: var div = document.getElementById( 'div_id' ); div.onmouseover = function() { this

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 由 翻译 强力驱动 问题: We filmed a spokesperson on a green screen and have the video files ready in multiple formats. With Flash we could use the wmode transparent within the param and embed tags, but is there something similar to this with the video and source tags in HTML5? Is it even possible to properly save .m4v or .ogv videos so that we can play these files with transparent backgrounds on our browsers? Thanks 回答1: Yes, this sort of thing is possible without Flash: http://hacks.mozilla.org/2009/06/tristan-washing-machine/ http://jakearchibald.com

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: Perhaps I am missing something, but I am just learning javascript. My understanding of Single Origin Policy is that Google Analytics should not be able to send data back to Google. How is it able to transmit send data to Google without violating the policy? 回答1: From what I can tell, a webpage includes the JavaScript file from Google, then that script dynamically adds an image to the page ( http://www.google-analytics.com/__utm.gif ) which contains the information required for logging. SOP does not apply to scripts, images or CSS files that

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 由 翻译 强力驱动 问题: I try to get the number of queries I found in background. So I use countobjects method to get the number, but system has warning about it "A long-running operation is being executed on the main thread." PFQuery * query2 =[ PFQuery queryWithClassName :@ "Comments" ]; [ query2 whereKey :@ "Name" equalTo : globalName ]; NSInteger CommentPoint = query2 . countObjects ; so i change to this method, but i can't get numbers of count print in my console. [ query2 countObjectsInBackgroundWithBlock :^( int count , NSError * error ) { if (!

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: What's the best approach to use background transfer to upload assets from gallery? Seems like uploadTaskWithRequest:fromData: doesn't work with NSURLSession created with backgroundSessionConfiguration since it causes an exception: "Terminating app due to uncaught exception 'NSGenericException', reason: 'Upload tasks in background sessions must be from a file". Judging from the exception description background transfer shouldn't work with streamed upload tasks too. Fair enough. uploadTaskWithRequest:fromFile: is the first thing that comes to