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中国新技术新产品 2025年第7期 53-55页

作者：滕岳桓蔡翔原昕孔珺婷石隶坤国网银川供电公司宁夏银川750001

为实现变电运维数据的高效管理,提高数据质量,本文开展了基于HTML5+javascript的变电运维数据管理系统研究。首先,对系统硬件进行选型设计,确保系统的稳定运行。其次,自动抓取并更新目标变电运行数据,确保数据的实时性和准确性。再次,... 详细信息

为实现变电运维数据的高效管理,提高数据质量,本文开展了基于HTML5+javascript的变电运维数据管理系统研究。首先,对系统硬件进行选型设计,确保系统的稳定运行。其次,自动抓取并更新目标变电运行数据,确保数据的实时性和准确性。再次,设计运维数据自动统计模块,提高数据处理效率。最后,整合管理跨表格自定义字段运维数据,将其存储到数据库表中,以便用户直观地了解变电运维情况。测试结果表明,该系统投入运行后,能够高效、安全地完成数据的存储和管理,与预期目标相符,且数据失真率较低,最高不超过0.1%,能够实现数据的准确管理,有效减少了数据管理错误的概率。

关键词： HTML5 javascript 变电运维数据

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Optimizing Asynchronous javascript Applications

Optimizing Asynchronous JavaScript Applications

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作者： Turcotte, Alexi Northeastern University

学位级别：Ph.D., Doctor of Philosophy

javascript is arguably today’s most popular programming language, and it is ubiquitous as the “language of the web”. It is dynamically typed, meaning that programmers do not write type annotations, and beyond this it also has a nonrestrictive dynamic semantics. This makes it easy for programmers to write code that runs, though determining if the code is correct or efficient is an entirely different story. Concretely, javascript’s dynamism renders sound and precise static analysis of the language extremely difficult. This complicates the development of tooling for javascript which could help programmers write correct and efficient code. Sound and precise analysis of javascript is beyond the state of the art, and in this thesis we explore the effectiveness of using unsound analysis to build tools to detect and remediate inefficiencies in asynchronous javascript programs. We explore the following thesis statement: Unsound analysis of asynchronous javascript applications yields actionable insights and effective optimizations. We support this statement with four approaches to detect and remediate sub-optimal anti-patterns in various application domains. Promising results in all cases suggest that perfect is the enemy of good, and that unsound approaches are viable and useful for improving javascript code.

关键词： Dynamic languages javascript Program analysis Programming languages Refactoring Software engineering

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JSForce: A Forced Execution Engine for Malicious javascript Detection 13th

JSForce: A Forced Execution Engine for Malicious JavaScript ...

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13th EAI International Conference on Security and Privacy in Communication Networks (SecureComm)

作者： Hu, Xunchao Cheng, Yao Duan, Yue Henderson, Andrew Yin, Heng Syracuse Univ Dept EECS Syracuse NY 13244 USA Univ Calif Riverside Dept Comp Sci & Engn Riverside CA 92521 USA

ISBN: (纸本)9783319788135;9783319788128

The drastic increase of javascript exploitation attacks has led to a strong interest in developing techniques to analyze malicious javascript. Existing analysis techniques fall into two general categories: static analysis and dynamic analysis. Static analysis tends to produce inaccurate results (both false positive and false negative) and is vulnerable to a wide series of obfuscation techniques. Thus, dynamic analysis is constantly gaining popularity for exposing the typical features of malicious javascript. However, existing dynamic analysis techniques possess limitations such as limited code coverage and incomplete environment setup, leaving a broad attack surface for evading the detection. To overcome these limitations, we present the design and implementation of a novel javascript forced execution engine named JSForce which drives an arbitrary javascript snippet to execute along different paths without any input or environment setup. We evaluate JSForce using 220,587 HTML and 23,509 PDF real-world samples. Experimental results show that by adopting our forced execution engine, the malicious javascript detection rate can be substantially boosted by 206.29% using same detection policy without any noticeable false positive increase.

关键词： Malicious javascript Forced execution

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Efficient and Precise Dynamic Slicing for Client-Side javascript Programs 23

Efficient and Precise Dynamic Slicing for Client-Side JavaSc...

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23rd IEEE International Conference on Software Analysis, Evolution, and Reengineering (SANER)

作者： Ye, Jiabin Zhang, Cheng Ma, Lei Yu, Haibo Zhao, Jianjun Shanghai Jiao Tong Univ Shanghai 200030 Peoples R China Univ Waterloo Waterloo ON N2L 3G1 Canada Harbin Inst Technol Harbin Peoples R China

ISBN: (纸本)9781509018550

javascript is the de facto dominant programming language for developing web applications. Most popular websites are using javascript, especially to develop client-side features. Being syntactically flexible and highly dynamic, javascript is easy to use and productive, but its code is known to be less maintainable. The task of maintaining client-side javascript code is further complicated by the pervasive interactions between javascript code and HTML elements, through browsers. In this paper, we present JS-Slicer, a dynamic slicer for javascript, to ease the task of understanding and debugging practical client-side javascript code. JS-Slicer defines three types of dependences, including data dependences, control dependences, and DOM dependences, to capture all relationships between program elements. JS-Slicer extends a novel dynamic analysis framework and combines dynamic and static analysis to precisely capture the dependences at run-time. A lot of language specific issues are properly handled, which enables JS-Slicer to slice practical javascript code. Our evaluation on six real-world web applications and javascript libraries shows that JS-Slicer is both precise and efficient: on average it captures around 40K dependences in 2.5K lines of code, in less than 3.0 seconds.

关键词： Dynamic Program Slicing javascript Program Debugging

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Browser Performance of javascript Framework, SAPUI5 & jQuery

Browser Performance of JavaScript Framework, SAPUI5 & jQuery

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International Conference on Computational Science and Computational Intelligence (CSIC)

作者： Raigoza, Jaime Thakkar, Rushi Calif State Univ Chico Comp Sci Dept Chico CA 95929 USA

ISBN: (纸本)9781509055104

The research and commerce communities have a need to understand and use the Single-Page Application (SPA) framework written in javascript for knowledge discovery and global sharing of information. It is important to develop user-friendly web-based tools which efficiently process, analyze, and visualize scientific data. The efficient use of languages and tools such as HTML5, CSS3, and javascript Libraries is important. The need to asynchronously fetch new data and update the web page, without refreshing the entire page is essential to better visualize the data in real-time. Without any scientific methodology for comparing SPA frameworks written in javascript, it is troublesome to choose which one to use. Our work studies a method to better understand the web client technology with an interactive application. We build upon an existing open source web application javascript framework tool to measure the time distribution of client components. We study interactive web-based activity.

关键词： javascript jQuery Performance comparison SAPUI5 User Interface

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Sencha touch 1.0 mobile javascript framework : build web applications for Apple iOS and Google Android touchscreen devices with this first HTML5 mobile framework 1

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丛书名： From technologies to solutions

2012年

作者： Narasimha Rao

ISBN: (数字)9781849515115

ISBN: (纸本)9781849515108

Build web applications for Apple iOS and Google Android touchscreen devices with this first HTML5 mobile framework Learn to develop web applications that look and feel native on Apple iOS and Google Android touchscreen devices using Sencha Touch through examples Design resolution-independent and graphical representations like buttons, icons, and tabs of unparalleled flexibility Add custom events like tap, double tap, swipe, tap and hold, pinch, and rotate Plenty of well-explained sample code with the essential screenshots added in for thorough understanding In Detail Since its initial launch, Sencha Touch has quickly become the gold standard for developing rich mobile web applications with HTML5. Sencha Touch is the first HTML5 mobile javascript framework that allows you to develop mobile web apps that look and feel native on iPhone and Android touchscreen devices. Sencha Touch is the world's first application framework built specifically to leverage HTML5, CSS3, and javascript for the highest level of power, flexibility, and optimization. It makes specific use of HTML5 to deliver components like audio and video, as well as a localStorage proxy for saving data offline. Sencha Touch makes extensive use of CSS3 in its stylesheets to provide the most robust styling layer possible. Sencha Touch enables you to do things that previously required either custom software costing hundreds to thousands of dollars per designer and developer, or extensive knowledge of programming languages like Java. Interested in Sencha Touch, but do not know how to go about with it? Sencha Touch 1.0 Mobile javascript Framework is your introduction to the exciting and fast-growing mobile touch web application framework. This book will show you how you can use Sencha Touch and existing code libraries available in the framework today to more efficiently produce attractive, exciting, native-quality, user-friendly, easy-to-use web applications that keep your visitors coming back for more. Sencha To

关键词： framework javascript mobile touch sencha

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Correlation Tracking for Points-To Analysis of javascript 12

Correlation Tracking for Points-To Analysis of JavaScript

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26th European Conference on Object-Oriented Programming (ECOOP)

作者： Sridharan, Manu Dolby, Julian Chandra, Satish Schaefer, Max Tip, Frank IBM TJ Watson Res Ctr Yorktown Hts NY USA

ISBN: (纸本)9783642310577;9783642310560

javascript poses significant challenges for points-to analysis, particularly due to its flexible object model in which object properties can be created and deleted at run-time and accessed via first-class names. These features cause an increase in the worst-case running time of field-sensitive Andersen-style analysis, which becomes O(N-4), where N is the program size, in contrast to the O(N-3) bound for languages like Java. In practice, we found that a standard implementation of the analysis was unable to analyze popular javascript frameworks. We identify correlated dynamic property accesses as a common code pattern that is analyzed very imprecisely by the standard analysis, and show how a novel correlation tracking technique enables us to handle this pattern more precisely, thereby making the analysis more scalable. In an experimental evaluation, we found that correlation tracking often dramatically improved analysis scalability and precision on popular javascript frameworks, though in some cases scalability challenges remain.

关键词： Points-to analysis call graph construction javascript

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Discovering User-Defined Event Handlers in Presence of javascript Libraries 22

Discovering User-Defined Event Handlers in Presence of JavaS...

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22nd Asia-Pacific Software Engineering Conference (APSEC)

作者： Wang, Shuai Dou, Wensheng Gao, Chushu Wei, Jun Huang, Tao Chinese Acad Sci Technol Ctr Software Engn Inst Software Beijing Peoples R China

ISBN: (纸本)9781467396448

javascript libraries, such as JQuery, are widely used in web applications. In these libraries' event delegation models, a DOM element's event handler is usually bound to its parent nodes. This makes it difficult for developers to figure out the user-defined event handlers of a specified DOM element. In this paper, we propose an approach that identifies the user-defined event handlers of DOM elements in a web page. We dynamically collect the execution trace for each triggered event in a web page, and analyze how each function is used in the execution trace to discover the event handlers for each event. We evaluate our approach on seven real-world web applications. The result shows that our approach is effective, with an overall precision of 100% and recall of 99.8%.

关键词： javascript event event delegation

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Mastering javascript High Performance

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丛书名： Community experience distilled

2015年

作者： Chad R. Adams

ISBN: (纸本)1784397296;9781784397296

Master the art of building, deploying, and optimizing faster web applications with javascript About This BookTest and optimize javascript code efficientlyBuild faster and more proficient javascript programs for web browsers and hybrid mobile appsStep-by-step tutorial stuffed with real-world examplesWho This Book Is ForIf you are a javascript developer with some experience in development and want to increase the performance of javascript projects by building faster web apps, then this book is for you. You should know the basic concepts of javascript. In Detail Studying javascript performance in depth will make you capable of tackling the complex and important tasks required to solve performance issues. In this book, you'll learn when and why to use an IDE over a common text editor. Packed with examples, you'll also learn how to create a build system to test and deploy your javascript project by optimizing the code. Next, you will move on to learn about DOM optimization, javascript promises, and web workers to better break up your large codebase. You will also learn about javascript performance on mobile platforms such as iOS and Android and how to deploy your javascript project to a device. Finally, by the end of the book, you'll be able to pinpoint javascript performance problems using appropriate tools, provide optimization techniques, and provide tools to develop fast applications with javascript.

关键词： performance javascript mastering

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Head First javascript Programming 1

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丛书名： Head First

2014年

作者： Eric T. Freeman, Elisabeth Robson

ISBN: (纸本)144934013X;9781449340131

What will you learn from this book?This brain-friendly guide teaches you everything from javascript language fundamentals to advanced topics, including objects, functions, and the browsers document object model. You wont just be readingyoull be playing games, solving puzzles, pondering mysteries, and interacting with javascript in ways you never imagined. And youll write real code, lots of it, so you can start building your own web applications. Prepare to open your mind as you learn (and nail) key topics including:The inner details of javascriptHow javascript works with the browserThe secrets of javascript typesUsing arraysThe power of functionsHow to work with objectsMaking use of prototypesUnderstanding closuresWriting and testing applicationsWhats so special about this book?We think your time is too valuable to waste struggling with new concepts. Using the latest research in cognitive science and learning theory to craft a multi-sensory learning experience, Head First javascript Programming uses a visually rich format designed for the way your brain works, not a text-heavy approach that puts you to sleep.

关键词： programming javascript first head

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