pros and cons of rapid prototyping

functionality that Xamarin provides, at roughly the same cost. When considering both approaches, the most common dilemma is Xamarin vs Ionic or Xamarin vs React Native (see also our about Reactjs and React A comprehensive explanation of the pros and cons of native ). However, the latter tends to fail due to many limitations in the underlying technology (web stack) . However, JavaScript-based mobile d

Comparative analysis of the pros and cons of mainstream PHP frameworks, comparative analysis of framework advantages and disadvantages PHP is a popular open source server-side scripting development language both at home and abroad. Able to adapt to the development needs of large and medium-sized projects. In this article we will introduce several mainstream PHP framework and its related advantages and disa

framework can be customized, extensibility, because each project is not sure whether you will change with the needs of change. Relatively speaking, the Zend framework and the Symfony have a strong ability to cope with change, especially if you can customize the class of the model layer, it is very convenient to add their own business or data processing classes, I am a personal comparison recommended in large projects in the use of PHP framework. Codeingiter and CakePHP also play a significant r

to send an asynchronous request to the server via the XMLHttpRequest object, get the data from the server, and then use JavaScript to manipulate the DOM and update the page. One of the most critical steps is getting the request data from the server. To understand this process and principle, we must have some knowledge of xmlhttprequest.XMLHttpRequest is the core mechanism of Ajax, which was first introduced in IE5 and is a technique that supports asynchronous requests. Simply put, JavaScript ca

standards 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 vi

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

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

the previous service-side code is now placed on the client), destroying the original standards of the Web. Ajax attention points 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

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 component to tell the user that the system is in the background and is reading data and content.(2). Ajax Application S

the user can already see the interface. Can be very good to prevent the interface is too complex to cause the black screen time is too long, but this is only a way to improve the user experience, to root or optimize the interface. The data is then asynchronously loaded. Finally, there is a handler used by the small strategy, when the data is more than the time can be appropriate to delay the handler send, for example, can call handler.sendemptymessagedelayed, set a delay time.Six, the network a

= Moviehandler () parser.setcontenthandler (Handler) parser.parse ("Movies.xml") def foo ( Bar=[]): # Bar is an optional parameter, if not specified, the default value is []bar.append ("Mky"); # But there's a problem with this line, and I'll see ... return bar;print foo () print foo () odd = lambda X:bool (x% 2) Nums = [n for n in range (]nums[:] = [n for n-nums if not odd (n)] # Ah, this beautiful print nums This example is primarily for sax_xml reading, as well as defining parameter defaul

, and so on exactly what, you should use MySQL. 3, if your application to the integrity and seriousness of the data requirements is not high, but the pursuit of high speed processing. For example, it is a forum and community where you should use MySQL. 4, your application is a serious business application, the data integrity requirements are high. And you want to have a good encapsulation of some business data logic, such as an online bank, you should use PostgreSQL. 5, your application is deali

performance is also controllable (100 SQL statements interact once, even if the delay is increased from the same city 1ms to an offsite 50ms, also just increase 49ms, if the interaction 100 times, then increase 4900ms). In the Internet industry, where stored procedures are rarely used, one important reason is the widespread use of MySQL, while the MySQL stored procedure is weak (compared to a commercial database) and has a certain relationship with the changes in the Internet industry. Ci

this.sayName != "function"){ Person.prototype.sayName = function(){ alert(this.name); } }}Parasitic constructor modeIt is recommended that you do not use this mode in situations where other modes are available.Secure constructor ModeSafe object: As the name implies, is very safe, refers to the absence of public properties, and its methods do not reference this object. Secure objects are best suited in some secure environments where this and new are forbidden.function