cons appliances

Python's syntax is simple--in the form of indentationThere are advantages and disadvantages of indentation:One of the benefits is forcing you to write formatted code, but it doesn't specify whether the indentation is a few spaces or tab. In accordance with established management, you should always stick to the indentation of 4 spaces.The second is to force you to write less indented code, and you will tend to split a very long code into several functions , resulting in less code being indented.T

program is re-entered, you need to update the status in the main interface. For example, when I quit on my interface, the next time I log in again, if I don't update the state of the main interface. Will go directly to this interface about me. This demand is not the state we want.Let's look at the second architecture .　　It is clear that this architecture will be more clear and clearer. Let's take a look at the principle of this program: The architecture of this program is to manage the switch b

complex point query Statements (tables, multiple subqueries, conditional mates) is very painful, and to use the tool to see whether the generated statements are logical, and can not be constantly debugging (I think the function is debugging out, the brain hole big open people can skip);EF Replacement version is really a pit, if you want to upgrade the program's EF from the lower version to the higher version, the higher version will be less than many methods (see the data is clearly written sql

. And RN is now divided into two sets of code, one is the Android is iOS. But the difference is not big. The UI written by HM has tried, it's a little bit uncomfortable, and it's very difficult to write the layout of the special dot. In this place RN has a great advantage.In terms of the cost of learning, I prefer RN, because the JS code of RN is react.js, but the use of JSX standards. The current contact of the two framework, I still prefer RN, although the development of HM is quite high effic

1 WebForm Advantages1) Support event Model development, thanks to the rich service-side components, WebForm development can quickly build Web applications2) Easy to use, easier to get started3) Control-rich WebForm2 WebForm Disadvantages1) Encapsulation is too strong, many strata things let us beginners do not quite understand2) Easy to get started, improve hard.3) Complex life cycle models are not easy to learn.4) control is not flexible5) ViewState Treatment6) Asynchronous request each request

Polymorphic Parent-Child class transition conditions:The principle of forcing a parent class in Java to be cast to a subclass: the reference of the parent type to the instance of which child class, which can be converted to a reference to which subclass.Benefits of Polymorphism:You can accept arbitrary subclass objects as formal parameters.Disadvantages of polymorphism:You cannot use the unique properties and behaviors of subclasses.Java polymorphism pros and

core function is very few, does not install the plug-in basically cannot use.BUGZILLA:Advantages:1, Bugzilla no charge,2, Bugzilla now has Chinese version supportDisadvantages:1, Bugzilla can only manage defectsApple XCode:Advantages:1, you can automatically create a classification chart.2. Automatically provides undo, redo, and save functions without writing any coding.Disadvantages:1, after the update version, a plugin may become invalid.What are the current popular source program version man

instantiated when static methods in the class are executed. If you are using Singleton, the only instance that is generated will always be in memory and will not be purged by GC (because static attribute variables are not purged by GC) unless the entire JVM exits. I thought about it for a few days, and I wrote the code myself to do an experiment. Point three: (good! )because of the DAO initialization, will be compared to the system resources, if the static method to take, will continue to initi

of linear tablesvoid Mergelist (Seqlist *la, Seqlist *lb, Seqlist *LC){int i = 0, j = 0, k = 0;while ((I {if (La->elem[i] {Lc->elem[k] = la->elem[i];i++;k++;}Else{Lc->elem[k] = lb->elem[j];j + +;k++;}}while (i {Lc->elem[k] = la->elem[i];i++;k++;}while (J {Lc->elem[k] = lb->elem[j];j + +;k++;}Lc->last = la->last + lb->last + 1;}Advantages of the Sequential table: 1. There is no need to add additional storage space to represent the logical relationship between nodes;2. It is convenient to randoml

) { };// 滑动hammer.ontap =function(ev) { };// 单击hammer.ondoubletap =function(ev) { };//双击hammer.onhold =function(ev) { };// 长按hammer.ontransformstart =function(ev) { };// 双指收张开始hammer.ontransform =function(ev) { };// 双指收张中hammer.ontransformend =function(ev) { };// 双指收张结束hammer.onrelease =function(ev) { };// 手指离开屏幕在Pinch事件和Rotate事件中，我们用了hammertime.add(new Hammer.Pinch());和hammertime.add(new Hammer.Rotate ());而其他四个事件没有用，而是直接添加了事件的监听程序。原因在于，我们在new Hammer(htmlElement)的时候，Hammer.js默认对Pan、Press、Swipe和T

Transfer from http://blog.sina.com.cn/s/blog_b5a157500101ld71.htmlservlet: is based on Java technology, applied to the server-side program components, the essence is Java code, for management and sub-Send a user request.servlet container : Used to manage servlets, including loading, instantiating, and destroying Servlets.Servlet Main Features:1, dynamically return the entire HTML page according to customer request.2, you can communicate with other resources on the server, including databases, ot

Event Delegation Principle : event bubbling mechanism.Pros : 1. You can save a lot of memory footprint and reduce event registration. For example, UL agent all Li's Click event is very good.2. Can be implemented when new sub-objects, no longer need to be bound to the event, the dynamic Content section is particularly appropriatecons : The common application of event agents should be limited to the above requirements, and if you use event proxies for all events, event errors may occur. Events tha

November 1988, The Knoll Brothers and Fred Mitchell,adobe, the head of the oral agreement contract, and the following April to complete a real legal contract. The key word on the contract was "license to distribute (authorized sales)" and Adobe did not outright buy out of the program until a few years later Photoshop was a great success. After signing the contract, Thomas and John Brothers began to develop new versions to release sales. and Adobe decided to retain the name Photoshop.Advantages

. When NAT is present, the initial design of the TCP/IP protocol process changes and the Internet can become very vulnerable.(3) Nat violates the design principle of the basic network hierarchical structure model. Because in the traditional network hierarchy model, the nth layer cannot modify the header content of the n+1 layer. Nat destroys the principle of independence for each layer.(4) Some applications are inserting IP addresses into the content of the body, such as the standard FTP protoco

. 13.2012 October 26, Windows8 in the United States officially launched. Windows 8 supports chip architectures from Intel, AMD and ARM, and is used on PCs and tablets, especially mobile touch devices such as touch-screen phones, tablets, and more. The system has a good battery life and starts faster, consumes less memory, and is compatible with the software and hardware supported by Windows 7. In addition, in the interface design, the use of planar design. .Windows 10 was the last version of Wi

Current popular source program version management software and project management software: Microsoft tfs,github,svn,codingrespective Advantages and disadvantages:Microsoft TFS:Advantages:The Mission edition is a great place to take your needs and project progress, and it's more useful for small teams than Gantt charts.Can be seamlessly engaged with VSDisadvantages:TFS's consumption of personal costs is relatively larger.With complex, seemingly powerful configuration management, TFS sees online

, of course, git can also be restored through the historical version, but it is not easy to implement a partial restore.In short, the company's development team in the complex multi-project development, SVN is a better choice.Sign up: I found Git's website and followed http://www.aehyok.com/Blog/Detail/73.html and http://www.cnblogs.com/greyzeng/p/. The 5046776.html method is registered well. There is nothing to solve the problem, but still hope to launch the Chinese version of the ~Successful

Apple XCode:Advantages: (1) You can automatically create a category chart.(2) automatically provides undo, redo, and save functions without writing any coding.Disadvantage: A plugin may become invalid after updating the version.OpenprojOpenproj is a free and open source application that works perfectly on UNIX, Linux, Windows or Mac systems. It's a replacement for all Microsoft Project desktop applications, and you can even open a local project file. The scheme has features such as cost accounti

code, or designing for a product setup, still doesn't look that smooth.3, the advantages and disadvantages of TRAC:Pros: Very flexible and can be controlled with SVN integrationCons: The function is not very powerful4, the advantages and disadvantages of Bugzilla:Advantages: Free, with Chinese version supportCons: Fast search results are inaccurate. Only defects can be managed.5. Advantages and disadvantages of Apple Xcode:Advantages: Very fast compilation, fast and easy for each operation. Aut

view of Internet Explorer is unsafe, so many users began to turn to other browsers, Ff,opera is the rise of this period.Gecko: This is the kernel used by Firefox and Flock, which has the advantage of being powerful, rich, and capable of supporting many complex web effects and browser extensions, but at the cost of a lot of resources, like memory.Presto:opera uses the Presto kernel, the Presto kernel is known as the most popular browsing Web page of the fastest core, which is due to its natural