The Book of javascript teaches readers how to add interactivity, animation, and other tricks to their web sites with javascript. Rather than provide a series of cut-and-paste scripts, thau! takes the reader through a ...
详细信息
ISBN:
(纸本)1593271069
The Book of javascript teaches readers how to add interactivity, animation, and other tricks to their web sites with javascript. Rather than provide a series of cut-and-paste scripts, thau! takes the reader through a series of real world javascript code with an emphasis on understanding. Each chapter focuses on a few important javascript features, shows how professional web sites incorporate them, and takes readers through examples of how they might add those features to their own web sites. This thoroughly updated 2nd edition includes new chapters on Ajax, revised appendices, and new examples throughout. Summary sections and assignments close each chapter, making the book perfect for use in college courses or independent study. CD includes code and images for every example, answers to assignments, script libraries for hard-to-program applications, and many useful software programs.
The need for developers to be able to update mobile apps immediately on discovery of a critical is something the Apple iOS software patching system does not allow through their traditional app patching lifecycle. Two ...
详细信息
ISBN:
(纸本)9781908320803
The need for developers to be able to update mobile apps immediately on discovery of a critical is something the Apple iOS software patching system does not allow through their traditional app patching lifecycle. Two tools have been developed to solve this problem, one commercial and one opensource. Both employ javascript and dynamic code downloads and provide a method for users to receive immediate updates, but both have the potential to be abused and open the user to multiple security vulnerabilities. This paper will discuss the how tools JSPatch and Rollout. io, open-source and commercial respectively, enable quick updates but also expose users to multiple security vulnerabilities.
Most modern javascript engines use just-in-time (JIT) compilation to translate parts of javascript code into efficient machine code at runtime. Despite the overall success of JIT compilers, programmers may still write...
详细信息
ISBN:
(纸本)9781450336758
Most modern javascript engines use just-in-time (JIT) compilation to translate parts of javascript code into efficient machine code at runtime. Despite the overall success of JIT compilers, programmers may still write code that uses the dynamic features of javascript in a way that prohibits profitable optimizations. Unfortunately, there currently is no way to measure how prevalent such KT-unfriendly code is and to help developers detect such code locations. This paper presents JITProf, a profiling framework to dynamically identify code locations that prohibit profitable JIT optimizations. The key idea is to associate meta-information with javascript objects and code locations, to update this information whenever particular runtime events occur, and to use the meta-information to identify JIT-unfriendly operations. We use JITProf to analyze widely used javascript web applications and show that JIT-unfriendly code is prevalent in practice. Furthermore, we show how to use the approach as a profiling technique that finds optimization opportunities in a program. Applying the profiler to popular benchmark programs shows that refactoring these programs to avoid performance problems identified by JITProf leads to statistically significant performance improvements of up to 26.3% in 15 benchmarks.
Online mini games are lightweight game apps, typically implemented in javascript (JS), that run inside another host mobile app (such as WeChat, Baidu, and Alipay). These mini games do not need to be downloaded or upgr...
详细信息
ISBN:
(纸本)9781450371230
Online mini games are lightweight game apps, typically implemented in javascript (JS), that run inside another host mobile app (such as WeChat, Baidu, and Alipay). These mini games do not need to be downloaded or upgraded through an app store, making it possible for one host mobile app to perform the aggregated services of many apps. Hundreds of millions of users play tens of thousands of mini games, which make a great profit, and consequently are popular targets of plagiarism. In cases of plagiarism, deeply obfuscated code cloned from the original code often embodies malicious code segments and copyright infringements, posing great challenges for existing plagiarism detection tools. To address these challenges, in this paper, we design and implement JSidentify, a hybrid framework to detect plagiarism among online mini games. JSidentify includes three techniques based on different levels of code abstraction. JSidentify applies the included techniques in the constructed priority list one by one to reduce overall detection time. Our evaluation results show that JSidentify outperforms other existing related state-of-the-art approaches and achieves the best precision and recall with affordable detection time when detecting plagiarism among online mini games and clones among general JS programs. Our deployment experience of JSidentify also shows that JSidentify is indispensable in the daily operations of online mini games in WeChat.
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 w...
详细信息
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.
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 br...
详细信息
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.
Scores of compilers produce javascript, enabling programmers to use many languages on the Web, reuse existing code, and even use Web IDEs. Unfortunately, most compilers inherit the browser's compromised execution ...
详细信息
ISBN:
(纸本)9781450356985
Scores of compilers produce javascript, enabling programmers to use many languages on the Web, reuse existing code, and even use Web IDEs. Unfortunately, most compilers inherit the browser's compromised execution model, so long-running programs freeze the browser tab, ininite loops crash IDEs, and so on. The few compilers that avoid these problems sufer poor performance and are diicult to engineer. This paper presents Stopify, a source-to-source compiler that extends javascript with debugging abstractions and blocking operations, and easily integrates with existing compilers. We apply Stopify to ten programming languages and develop a Web IDE that supports stopping, single-stepping, breakpointing, and long-running computations. For nine languages, Stopify requires no or trivial compiler changes. For eight, our IDE is the first that provides these features. Two of our subject languages have compilers with similar features. Stopify's performance is competitive with these compilers and it makes them dramatically simpler. Stopify's abstractions rely on first-class continuations, which it provides by compiling javascript to javascript. We also identify sub-languages of javascript that compilers implicitly use, and exploit these to improve performance. Finally, Stopify needs to repeatedly interrupt and resume program execution. We use a sampling-based technique to estimate program speed that outperforms other systems.
javascript(1) is heavily used in the web, yet it is much slower than other languages. To improve the javascript performance, ahead-of-time compilation (AOTC) has been used, either to reuse the bytecode or the machine ...
详细信息
ISBN:
(纸本)9781450351843
javascript(1) is heavily used in the web, yet it is much slower than other languages. To improve the javascript performance, ahead-of-time compilation (AOTC) has been used, either to reuse the bytecode or the machine code generated by the baseline just-in-time compilation (JITC). javascript engines today employ high-performance optimizing JITC. So, we propose an AOTC that reuses the code generated by the optimizing JITC. It is more challenging than existing AOTCs since we need to handle more complex address relocation issues. Our preliminary evaluation shows that the proposed AOTC is promising, though.
Its true: if you know HTML, CSS, and javascript, you already have the tools you need to develop Android applications. Now updated for HTML5, the second edition of this hands-on guide shows you how to use open source w...
详细信息
ISBN:
(纸本)1449316417;9781449316419
Its true: if you know HTML, CSS, and javascript, you already have the tools you need to develop Android applications. Now updated for HTML5, the second edition of this hands-on guide shows you how to use open source web standards to design and build apps that can be adapted for any Android device. Youll learn how to create an Android-friendly web app on the platform of your choice, and then use Adobes free PhoneGap framework to convert it to a native Android app. Discover why device-agnostic mobile apps are the wave of the future, and start building apps that offer greater flexibility and a much broader *** a website into a web application, complete with progress indicators and other features Add animation with JQTouch to make your web app look and feel like a native Android app Make use of client-side data storage with apps that run when the Android device is offline Use PhoneGap to hook into advanced Android features, including the accelerometer, geolocation, and alerts Test and debug your app on the Web with real users, and submit the finished product to the Android Market
We examine the lifetime of API vulnerabilities on Android and propose an exponential decay model of the uptake of updates after the release of a fix. We apply our model to a case study of the javascript-to-Java interf...
详细信息
ISBN:
(数字)9783319260969
ISBN:
(纸本)9783319260969;9783319260952
We examine the lifetime of API vulnerabilities on Android and propose an exponential decay model of the uptake of updates after the release of a fix. We apply our model to a case study of the javascript-to-Java interface vulnerability. This vulnerability allows untrusted javascript in a WebView to break out of the javascript sandbox allowing remote code execution on Android phones;this can often then be further exploited to gain root access. While this vulnerability was first publicly disclosed in December 2012, we predict that the fix will not have been deployed to 95% of devices until December 2017, 5.17 years after the release of the fix. We show how this vulnerability is exploitable in many apps and the role that ad-libraries have in making this flaw so widespread.
暂无评论