specifications

问题 A number of sources (e.g. What is the meaning of erb? and three out of the top four results from this google search) cite http://ruby-doc.org/stdlib-1.8.7/libdoc/erb/rdoc/ERB.html as the official documentation on the ERB format, but that really just gives you the API rather than the file format. I found a nice little summary in http://docs.puppetlabs.com/guides/templating.html#erb-template-syntax, but there's got to be something more official, right? And who is the "defining authority"? Did

问题 In UML specification superstructure 2.5(still Beta, page 203) A Class may be designated by setting isActive to true as active (i.e., each of its instances is an active object). When isActive is false the Class is passive (i.e., each of its instances executes within the context of some other object). I wonder if there is a simple example illustrates the differences in applying each one of them? And elaborate this concept a bit? 回答1: By definition, Active Objects In UML, active classes, and

问题 On the http://php.net/manual/en/language.operators.precedence.php webpage, the second highest precedence level contains a left-associative operator called [ . I don't understand that. Is it the [ used to access/modify array entries, as in $myArray[23] ? I cannot imagine any code snippet where we would need to know the "precedence" of it wrt other operators, or where the "associativity" of [ would be useful. 回答1: This is a very valid question. 1. Precedence in between [...] First there is

问题 Closed . This question needs to be more focused. It is not currently accepting answers. Want to improve this question? Update the question so it focuses on one problem only by editing this post. Closed 2 years ago . One of the items in the Joel Test is that a project/company should have a specification. I'm wondering what makes a spec good. Some companies will write volumes of useless specification that no one ever reads, others will not write anything down because "no one will read any of it

问题 How can I use Specification and Pageable together? personelRepository.java @Query("SELECT e FROM PersonelEntity e ") List<PersonelEntity> findData(Specification<PersonelEntity> test, Pageable pageable); personelService.java public List<PersonelEntity> filteredData(Specification<PersonelEntity> filter,Pageable pageable){ List<PersonelEntity> filteredData = personelRepository.findData(filter,pageable); return filteredData; } personelController.java Pageable reqCount = new PageRequest(0, 10);

问题 Using prompt() I am generating some html to and need to know the maximum length that I can put in the popup. I can't find anything in the spec about this, wondering if someone can help 回答1: The ECMAScript Programming Language Specification does not specify any maximum length. The maximum length with will be implementation-specific i.e, based on available memory. 回答2: Here are some real world numbers in case anyone is interested. Please add more if you have any. Using the following code in the

问题 A friend made me look at this page, and noticed a strange piece of code in the signature of one of the forum users. The code is a one-liner that goes as follows: On Local Error Resume Next: If Not Empty Is Nothing Then Do While Null: ReDim i(True To False) As Currency: Loop: Else Debug.Assert CCur(CLng(CInt(CBool(False Imp True Xor False Eqv True)))): Stop: On Local Error GoTo 0 Scrolling removed: On Local Error Resume Next: If Not Empty Is Nothing Then Do While Null: ReDim i(True To False)

问题 You can see in the code below that the h1 pushes down the body and the absolutely-positioned block .absolute does not stick to the top. But you also can see that the same block is stuck to the top of its parent .wrapper . Why? I'm not asking how to do that trick; I know how, e.g. padding instead margin to h1, or clearfix to parent and so on. I'm interested in only one thing: why h1 's margin pushes down the body , but is not pushing down .wrapper ? body { position: relative; margin: 0;

问题 A URL like http://localhost/path?a=b&c=d is fine - but what is the status of the same URL with a trailing ampersand? http://localhost/path?a=b&c=d& For example the Java Servlet API allows it where Scala's Spray does not (ie it throws an error). I've tried to find the answer in the URI syntax spec, but not sure how to parse their grammar. 回答1: The URI syntax spec is for generic URIs. It allows anything in the query. I am not aware of any specification which actually specifies ampersand

问题 I was experimenting with how / is interpreted when around different keywords and operators, and found that the following syntax is perfectly legal: // awaiting something that isn't a Promise is fine, it's just strange to do: const foo = await /barbaz/ myFn() Error: Uncaught ReferenceError: await is not defined It looks like it tries to parse the await as a variable name ..? I was expecting await is only valid in async function or maybe something like Unexpected token await To my horror, you