基于HTML5技术的游戏开发与实现

HTML5技术的发展,也带动了游戏行业的飞速发展。基于HTML5技术的连连看游戏是一款休闲益智类的小游戏,主要利用了HTML5新增的Canvas标签来布局页面,使用CSS3.0修饰页面,利用JavaScript脚本实现游戏的主要逻辑。HTML5游戏开发周期短,可移植性强,已成为近年来游戏行业最热门的关键词之一。     

面向数据泄漏的Web沙箱测试方法

数据泄漏是导致Web沙箱逃逸的重要原因,即在未授权情况下,程序可以访问系统的敏感数据。已有的Web应用安全分析方法不完全适用于发现Web沙箱的数据泄漏。设计一种面向数据泄漏的Web沙箱测试方法,在JavaScript对象建模的基础上,首先,采用深度优先的策略遍历浏览器的原生对象,获取程序可直接访问的对象集合;其次,设计敏感点导向的封装对象测试算法,获取程序间接访问的对象集合;再次,设计了多程序数据泄漏的测试算法,获取程序间可能的通信路径;最后,对比测试结果和Web沙箱的规格,以识别Web沙箱的数据泄漏。设计并实现了Web沙箱测试系统(WSTS),同时测试了不同版本的ADsafe沙箱,实验结果显示,所提方法具有良好的数据泄漏发现能力。     

Scalable framework for parsing: from Fortress to JavaScript

Programming languages grow over time that requires frequent changes in language manipulations such as compilation, interpretation, and analysis. Because the very first step of most language manipulations is parsing, whether parsing can adapt to changes easily, quickly, and correctly, it affects the scalability of language manipulations. Even though various parsing techniques have been well studied theoretically, their practical experiences in scalable frameworks have not been available. In this paper, we present our experiences with parsing in scalable frameworks. We first describe our trials and errors using various parsing techniques in developing parsers for the Fortress programming language. Because Fortress was a scientific language under development, its mathematical and growable syntax introduced new challenges in parsing. We summarize the lessons learned from parsing Fortress, and we share our experience of applying the lessons to parsing the JavaScript programming language. While JavaScript is one of the most widely used languages, JavaScript itself and its diverse variants keep extending its syntax, and the extremely dynamic features of JavaScript also add new challenges in parsing. Using automatic generation tools and methods like staged parsing and automatic extraction and testing of examples in language specifications, our methodology for scalable parsing has shown to be very effective in practice. Copyright © 2015 John Wiley & Sons, Ltd.     

Internet programs for drawing moth pheromone analogs and searching literature database

An Internet web page is described for organizing and analyzing information about lepidopteran sex pheromone components. Hypertext markup language (HTML) with JavaScript program code is used to draw moth pheromone analogs by combining GIF bitmap images for viewing by web browsers such as Netscape or Microsoft Internet Explorer. Straight-chain hydrocarbons of 5–22 carbons with epoxides or unsaturated positions of E or Z geometrical configuration with several alternative functional groups can be drawn by simply checking menu bars or checkboxes representing chain length, E/Z unsaturation points, epoxide position and chirality, and optional functional groups. The functional group can be an aldehyde, alcohol, or ester of formate, acetate, propionate, or butyrate. The program is capable of drawing several million structures and naming them [e.g., (E,E)-8,10-dodecadien-1-ol and abbreviated as E8E10–12:OH]. A Java applet program run from the same page searches for the presently drawn structure in an internal database compiled from the Pherolist, and if the component is found, provides a textarea display of the families and species using the component. Links are automatically specified for drawn components if found in the Pherolist web site (maintained by H. Arn). Windowed links can also be made to two other JavaScript programs that allow searches of a web site database with over 5900 research citations on lepidopteran semiochemicals and a calculator of vapor pressures of some moth sex pheromone analogs at a specified temperature. Various evolutionary and biosynthetic aspects are discussed in regard to the diversity of moth sex pheromone components.     

基于Ajax技术架构的考试系统设计

讨论Ajax技术原理及其在考试系统中的应用;给出了较详细的利用Ajax技术的设计方案和关键代码,实现了利用Ajax技术进行题库管理、答案提交、考试计时等功能.     

基于.Net技术的契税征收系统的设计与实现

分析当前契税征收现状,熟悉契税征收流程,设计了契税征收系统功能模块,运用ASP.Net技术,以及若干数据库技术,实现了契税征收系统。     

基于NS3的虚拟网络实验室构建及可视化实现

随着网络的发展,网络研究与实验也变得越来越复杂,但高校开展新颖网络实验却举步艰难,特别是针对某些需要大量物理设备才能顺利进行的实验,因为许多普通高校无法提供足够的硬件资源。因此,网络虚拟实验的实现就十分必要。当前,网络仿真实验以及网络仿真软件已有一定的发展基础,但在线可视化的虚拟网络平台上依旧是一块空缺。本文采用Linux下流行的LAMP架构,使用HTML5、JavaScript、Django和NS3等技术,开发了基于NS3的虚拟网络实验室构建及其在线可视化。     

Just-in-time value specialization

JavaScript emerges today as one of the most important programming languages for the development of client-side web applications. Therefore, it is essential that browsers be able to execute JavaScript programs efficiently. However, the dynamic nature of this programming language makes it very challenging to achieve this much needed efficiency. In this paper we propose parameter-based value specialization as a way to improve the quality of the code produced by JIT engines. We have empirically observed that almost 60% of the JavaScript functions found in the world's 100 most popular websites are called only once, or are called with the same parameters. Capitalizing on this observation, we adapt a number of classic compiler optimizations to specialize code based on the runtime values of function's actual parameters. We have implemented the techniques proposed in this paper in IonMonkey, an industrial quality JavaScript JIT compiler developed at the Mozilla Foundation. Our experiments, run across three popular JavaScript benchmarks, SunSpider, V8 and Kraken, show that, in spite of its highly speculative nature, our optimization pays for itself. As an example, we have been able to speed up V8 by 4.83%, and to reduce the size of its generated native code by 18.84%.     

实现电子政务网站的关键技术

采用MVC框架是实现电子政务网站的主流技术。通过一个具体政务网站实例,阐述了MVC框架结合多种技术实现电子政务网站的过程。