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1. When using the println () method for objects of type string, if the object is null, it will print null instead of raising the NullPointerException, which is an easy illusion, and can cause problems for subsequent operations on the string. 2. The

A Cookie is a small piece of data that can be embedded in an HTTP request and response and is generated on the server and returned to the user as part of the response header domain. When the browser receives a response that contains a cookie, it

Genericservlet class can be said to be the most important class in Jsdk, and also the most basic class. Programmers want to write servlet applications, typically inheriting JSDK-provided Genericservlet classes or its subclass HttpServlet

HttpServlet is inherited from Genericservlet, so it has genericservlet similar methods and objects, a package that we use with servlet programming, which supports methods such as post and get of HTTP. Programming Idea: The following example, the

With Symantec PcAnywhere 11.5 log windows2003 remote server, the display input username and password is normal, but enter user name and password after landing display black screen ... Symantec PcAnywhere 11.5 Solution for black screen after Windows 2

Let's catch all the questions about Ajax to help you get through the second channel and quickly learn about the beauty and sadness of Ajax. After years of development, the Web is still in the point of view, page change browsing mode. After the

Share 10 AJAX development standards and recommend AJAX learners ' Collections! 1. Before and after the end to do a good job of security checksCan not rely on the front-end to do security verification work, the back end must have a filtration

Always remember that there are a few visitors who can't use JavaScript or older browsers or they don't support JavaScript, like mobile devices. If none of this is supported, what can your visitors see? 1. Do not update the entire page by placing the

Tutorials | sample |jquery DOM OperationsPropertyWe take As an example, in the original JavaScript can use Var O=document.getelementbyid (' a ') to take the ID of a node object, When you use O.SRC to get or modify the SCR properties of the node, in

jquery is a same as prototype excellent JS development Library class, especially for CSS and XPath support, so that we write JS become more convenient! If you are not a JS master and want to write excellent JS effect, jquery can help you achieve the

I. Resource-type Web site 1, Domestic website 1 Ajax China (recommended) A professional AJAX technology site, classification clear, there are a large number of electronic version of the tutorial, as well as Ajax source

1. What is Ajax? The full name of Ajax is: Asynchronousjavascript+xml Definition of 2.Ajax: Ajax is not a technology, it is actually several technologies, each of which has its own uniqueness, and together it becomes a powerful new

The implementation of AJAX technology relies primarily on xmlhttprequest, but when we call it for the transmission of asynchronous data, the XMLHTTP is a short process (destroyed after processing the event) if the object is not wrapped, It is not a

ajax|javascript|web| Error | Solve the author in the study of QuickGuide.txt article at the same time, according to sequential Step-by-step approach, the results of the run, found that always appear such errors, "WebForm1" does not define JavaScript

　　What about the security of Ajax in Web development ? Now browsers allow users to improve their security levels, turn off JavaScript technology, and disable any options in the browser. In this case, the code will not work anyway. The problem must

If you choose a browser other than Internet Explorer, or you write code for a non-Microsoft browser, you need to use different code. In fact, this is the simple line of code shown in Listing 1: var xmlHttp = new XMLHttpRequest object;. This much

Ajax Ajax (Asynchronous JavaScript and XML) is a technology that uses JavaScript and Extensible Markup Language (XML) to transfer or accept data between Web browsers and servers. It is mainly used in the development of RIA (Rich Internet

Javascript How do I implement OO programming in JavaScript? I'm afraid the best way is to take full advantage of the prototype attribute. There are a lot of introductions about prototype, and I will not repeat them. The basic principle is that when

The xml| server uses some of the XMLHTTP's methods and properties to get information about the server. The XMLHTTP object methods and object properties are attached to the following article. For a status code problem, you can see my other document, "

xml| objects The Microsoft.XMLHTTP object is provided in MSXML to perform the conversion from the packet to the request object and to send the task. The statement that creates the XMLHTTP object is as follows: Set Objxml = CreateObject