overwatch what is next event

);httpRequest.send();}fn("text.xml", function(){　　　　//调用函数console.log(this); 　　//此语句后输出});console.log("this will run before the above callback.");　　//此语句先输出 We request asynchronous processing, which means that when we start the request, we tell them to call our function when it's done. In fact, the onReadyStateChange event handler also takes into account the failure of the request, where we assume that the XML file exists and can be successfu

I have a headache this evening, why?After all, halfway decent, my understanding of JavaScript just stuck in: invoking JavaScript, changing the page style, elements and implementing some of the response of the event, although the need for the time may be used, but the use of the principle is not very clear, as for the DOM, such a professional vocabulary, or save it.Just a night

be content) because, literally, uncertainty seems to imply that a 1-0 certainty event is more uncertain than a 50-50 uncertainty event, but it is also 50-50 uncertainty. , the risk is the same? As you can imagine, if you have a 50% chance of dying, and you have a 50% chance

What is JavaScript JavaScript is a scripting language that is object-based (object) and event-driven (driven) and has a secure performance. Use It is designed to link to a Web page with HTML Hypertext Markup Language, Java scripti

sessions are running: break on SID Skip 1 column SID format 99999 column Sql_text form A64 Select A.sid, A.last_call_et, B.sql_text from V$session a , V$sqltext b where a.username is not null and a.status = ' ACTIVE ' and a.sql_address = b.address ORDER by A.last_call_et,a.sid,b.piece; This gives us the statement and how long we are currently running, and you should be able to see which session you need to check. ,

This article mainly introduces the definition of Ajax, as well as the specific use of Ajax, now let's read this article 1. What is Ajax? A technique that allows a browser to communicate with a server without having to refresh the current page, called Ajax. In the actual programming process, often xmlhttprequest as a synonym for Ajax, XMLHttpRequest is an extensio

Document directory 1.4.1 Framework Design Experience and principles 1.4.2 how can it be called an excellent framework? 1.4.1 Framework Design Experience and principles 1.4.2 how can it be called an excellent framework? Framework? The emergence of frameworks, class libraries, and other concepts stems from people's desire for reuse. "Do not reinvent the wheel" has become a classic saying in the software industry. From the original reuse of the source code of a single function to the reuse of

What kind of monitoring tool is the most beloved of the Ops people?Which indicators need to be monitored? What can I monitor? How far can you monitor it? Perhaps these questions are not even clear to you. First look at the status of the Ops brothers.1 . Current status of operation and maintenanceThe traditional enterprise computer operation and maintenance

What is ESB? There is no detailed definition: ESB (Enterprise Service Bus) is the product of combining traditional middleware technologies with XML, web services, and other technologies. ESB provides the most basic connection hub in the network and is a necessary element for

. Let's take a look at Wikipedia's definition: A problem is an obstacle which makes it difficult to achieve a desired goal, objective or purpose. it refers to a situation, condition, or issue that is yet unresolved. in a broad sense, a problem exists when an individual becomes aware of a significant difference between what actually

kernel Blocks B. This example is to block I/O. In this mode, a thread can only process the I/O events of one stream. To process multiple streams at the same time, multiple processes or multithreading are required, however, their efficiency is not high. If you want to use a thread to process multiple streams, you only need to poll multiple streams, which is obv

networks (such as Wi-Fi in Public Places) or websites with security vulnerabilities, the former has a lower probability of occurrence, and the latter has a much greater impact on the website than the Cookie Theft. It is a serious fault for Internet companies and will soon be blocked once discovered. 　　4. What do they say about mastering hundreds of millions of cookies, website distribution codes, and so on