cons appliances

Advantages:1. Quick and convenient recording function, quick to get started2, the code conversion function is easy to use, easily generate test case code for other programming languages3. Support cross-domain4. Do not rely on Java allow environmentDisadvantages:1, recording playback mode of stability and reliability Limited2, only support Mozilla Firefox3, only support Selense command language, although can be exported to other programming language test cases4. Limited processing capacity for co

Haproxy is the first choice, at this time these things get started fast, easy to configure, on the seven layer above the use of HTTP protocol can. This is the first choice.The second stage: with the further expansion of network services, then the single-point nginx can not be satisfied, when the use of LVS or commercial array is the first choice, nginx at this time as a LVS or array of nodes to use, The specific LVS or array is selected according to the size of the company and the budget to cho

Object-oriented and process-oriented can only be programmed in one of many programming languages, but the PHP language differs from other programming languages in that we are free to choose or toIf you're new to PHP, writing code with PHP's process-oriented style is probably your only option. But if you go to PHP forums and newsgroups Often, you should see articles about "objects". You may also have seen tutorials on how to write object-oriented PHP code. Or you might have downloaded some out-of

In the actual project development process, the page is uploaded to the server, and in order to reduce the pressure on the server, so that users load less, the browser will be the picture, CSS, JS cache to the local, so that the next visit to use the site. This not only reduces the pressure on the server, but also reduces the number of downloads for the user and gives a better user experience.However, in the version upgrade or do some CSS, JS and other adjustments, the cache caused the user can n

dynamically modifying the server weight during the HAProxy run.Whether it is STATIC-RR, Roundrobin or leastconn, are natural support weight. Only during run time, the STATIC-RR server weight cannot be changed or changed and is not valid. All cases where weight is 1 are a special case of the weight-based load balancing algorithm.HAProxy disadvantages are not introduced. In combination with the individual on the NIGNX part of the understanding, listed some HAProxy less than Nginx place, for refer

. Paul Greeberg, an expert in ERP and CRM, wrote that "I have always really disliked BYD products, not just in the design and lack of functionality." ”However, it is still not possible for SAP to define resources that are open to midsize enterprises. Because SAP's business is a huge and complex ERP system for large multinational companies. Focusing on these complex businesses is a challenge, and it's no easy matter to focus on midsize businesses. As a result, SAP was unable to open its resources

The pros and cons of collecting PHP with MySQL and MSSQL Reply to discussion (solution) php5.3 before, both are the sameAfter the php5.3, with the MSSQL of the match received constraints, more difficult Is the reason why MySQL was acquired by Oracle! It's strange that you'll have this question. PHP is certainly with mysql,mssql, or ASP.The more mainstream collocation, the more difficult to solve the problem in the future, because you encounte

"Show the whole station system" and its discussion frame pros and cons, it is better to some practical, how do you think of my CMS system? Computer-side Access address: http://cmsdemo.youyax.com/ Phone-side access address: http://cmsdemo.youyax.com/m/ Of course, mobile phone access will automatically jump to the mobile version of the page The architecture of the system is different from the ordinary enterprise construction station system, a bit si

Advantages:1. Asynchronous requests, do not prevent users from browsing the page or other operations.2. Local refresh without re-refreshing the page.3. Interface and application separation. Facilitates division of labor, reduces web application errors caused by non-technical changes to the page, improves efficiency, and is more applicable to the current publishing system.4. Standards-based support is widely available.5. Front-end and back-end load balancing. Minimize the burden on the server of

security.Speed, because the BIOS has a hardware self-test at boot time, and this function is implemented in the EFI partition, the UEFI is relatively fast to boot. --------UEFI+GPT is not a hard disk to produce more than two hundreds of m of small partition Ah, look comfortable oh yes an MSR, that is, Microsoft Reserved partition, basically useless, but some time the system upgrade needs to detect the existence of the partition. An ESP, the EFI system partition, is the EFI boot system partition

of the Web.5.AJAX points of attention and applicable and non-applicable scenarios(1). Attention PointWhen Ajax is developed, network latency-that is, the interval between a user sending a request to a server to make a response-requires careful consideration. Not giving users a clear response, without proper pre-reading data, or improper handling of XMLHttpRequest, will make users feel delayed, which users do not want to see, but they do not understand. A common solution is to use a visual compo

1. Internal JS: In the page directly in the tag to write JS codeAdvantages: Compared to the use of inline JS, the internal JS code is more centralized, and the page structure of the implementation of the code is less coupling, easier to maintainDisadvantage: JS code is limited to the use of the current page, the code can not be reused by multiple pages, resulting in a high degree of code redundancy2. External JS: Introduction of external JS file (recommended)Advantages: 1. Page code and JS code

Request data simultaneous parameter to transcode Chinese charactersGet data, all parameter information will be exposedThe Get method is compared to the Post method:Advantages:GET:1. The request is convenient, directly with a complete path to request data acquisition2. The request body will not be sent during the sending request, and the server's encapsulation will not be compromised. From this point of view, get is safe relative to post.POST:1. When the request is sent, the parameters are encaps

not appropriate to use it alone.The technique for solving this problem is to borrow a constructor, that is, to call the parent type constructor inside the sub-type constructor. This allows each instance to have its own properties, while also guaranteeing that only the constructor pattern is used to define the type. However, the result of using this method is that you cannot get the common method of the parent class, that is, prototype the method of binding through the prototype.The most used in

) data name: (NSString ) fileName{NSString *path = [self filepath:filename];[data writeToFile:path atomically:YES];}Get file path+ (nsstring*) FilePath: (nsstring*) FileName {nsarray* mypaths = Nssearchpathfordirectoriesindomains (NSDocumentDirectory, Nsuserdomainmask, YES);nsstring* Mydocpath = [Mypaths objectatindex:0];nsstring* FilePath = [Mydocpath stringbyappendingpathcomponent:filename];return filePath;}Fourth method: Database storageThe library for SQLite is preset in the iOS SDK. Develo

efficiency. NBSP; 2, the connection between the view and the controller is too tight. Views and controllers are separated from each other, but they do have a tight connection, the view has no controller, its application is very limited, and vice versa, which prevents them from being reused independently. NBSP; 3, view low-efficiency access to model data. Depending on the model operator interface, the view may need to be called multiple times to obtain sufficient display data. Unnecessary freque

add a new method to an interface, all classes that implement the interface must be modified synchronously to implement this method, otherwise they cannot be compiled.8, the implementation of the abstract class can only be given by its subclasses, and Java is a single inheritance, so the abstract class as a type definition tool performance is greatly compromised. Any class that implements an interface can have a type of this interface, and a class can implement multiple interfaces at the same ti

dispatched by the operating system. A Python interpreter process has a main thread and the execution thread for multiple user programs. Multi-threaded parallel execution is prohibited even on multicore CPU platforms due to the existence of the Gil. A compromise solution to this problem is discussed in more detail later in the Threads and Processes section. 　　Of course, Python also has some other small shortcomings, in this does not enumerate, I want to say that any language is not perfect,

: Universal code, a standard encoding, Python2 the encoding that is used by default. At least 16 bits are required to store. Other encodings are optimized for this encoding, such as UTF-8,GBK.UTF-8: Compression and refinement of Unicode (numbers, letters and ASCII codes using 8-bit encoding to store), Python3 default encoding used, European characters: 2 bytes, 16-bit storage; Chinese characters: 3 bytes, 24 bit storage　　Summary: Python3 default encoding is UTF-8, encoding conversion principle:

that processing 10,000 non-blocking IO requires no more than 10,000 threads, and you can use 1000 or 2000 threads for processing. Because the non-blocking IO processing connection is asynchronous. When a connection sends a request to the server, the server treats the connection request as a request "event" and assigns the "event" to the corresponding function. We can put this handler function in the thread to execute and return the thread after execution. Such a thread can handle multiple event