《更快速網(wǎng)站（影印版）》內(nèi)容簡介：對于任何成功的網(wǎng)站來說，性能是至關重要的。但伴隨著不斷增長的豐富內(nèi)容和Ajax的過度使用，如今的Web應用已經(jīng)將瀏覽器推至性能極限。在《更快速網(wǎng)站（影印版）》中，Google的Web性能專家和前任雅虎首席網(wǎng)站性能官Steve Souders提供了寶貴的技術，來幫助你優(yōu)化網(wǎng)站性能。作者的上一《更快速網(wǎng)站（影印版）》是非常暢銷的《High Performance Web Sites》，它透露了80%的網(wǎng)頁加載時間是花在客戶端，使網(wǎng)絡開發(fā)世界為之震驚。在《更快速網(wǎng)站（影印版）》中，Souders和8位專家撰稿人提供了最佳實踐和實用建議，用于在三個范疇提高網(wǎng)站的性能：JavaScript——獲取用于了解Ajax性能的建議，編寫有效的JavaScript，創(chuàng)建響應程序，加載腳本時不阻止其他組件等等。Network——學習穿過多個域共享資源，減小圖片尺寸而不損失質量，以及使用分塊編碼（chunked encoding）來更快呈現(xiàn)頁面。Browser——探索內(nèi)嵌框架（iframe）的替代方案、如何簡化CSS選擇器和其他技術。對于當今的富媒體網(wǎng)站和Web 2.0應用來說，速度是至關重要的。有了這《更快速網(wǎng)站（影印版）》，你將學習到如何減少你的網(wǎng)站的加載時間，讓它們響應得更快。
作者簡介
Steve Souders，在Google從事網(wǎng)絡性能和開放源碼計劃方面的工作。他是YSlow（Firebug性能分析擴展）的創(chuàng)造者，并且擔任Velocity（0’Reilly的網(wǎng)絡性能和業(yè)務運營會議）的聯(lián)合主席。Steve經(jīng)常在會議上或者高級別公司中發(fā)言，包括微軟、亞馬遜、MySpace、Linkedln、Facebook。
圖書目錄
Credits Preface 1. Understanding Ajax Performance Trade-offs Principles of Optimization Ajax Browser Wow! JavaScript Summary 2. Creating Responsive Web Applications What Is Fast Enough? Measuring Latency When Latency Goes Bad Threading Ensuring Responsiveness Web Workers Gears Timers Effects of Memory Use on Response Time Virtual Memory Troubleshooting Memory Issues Summary 3. Splitting the Initial Payload Kitchen Sink Savings from Splitting Finding the Split Undefined Symbols and Race Conditions Case Study: Google Calendar 4. Loading Scripts Without Blocking Scripts Block Making Scripts Play Nice XHR Eval XHR Injection Script in Iframe Script DOM Element Script Defer document.write Script Tag Browser Busy Indicators Ensuring (or Avoiding) Ordered Execution Summarizing the Results And the Winner Is 5. Coupling Asynchronous Scripts Code Example: menu.js Race Conditions Preserving Order Asynchronously Technique 1: Hardcoded Callback Technique 2: Window Onload Technique 3: Timer Technique 4: Script Onload Technique 5: Degrading Script Tags Multiple External Scripts Managed XHR DOM Element and Doc Write General Solution Single Script Multiple Scripts Asynchronicity in the Real World Google Analytics and Dojo YUI Loader Utility 6. Positioning Inline Scripts Inline Scripts Block Move Inline Scripts to the Bottom Initiate Execution Asynchronously Use Script Defer Preserving CSS and JavaScript Order Danger: Stylesheet Followed by Inline Script Inline Scripts Aren’t Blocked by Most Downloads Inline Scripts Are Blocked by Stylesheets This Does Happen 7. Writing Efficient JavaScript Managing Scope Use Local Variables Scope Chain Augmentation Efficient Data Access Flow Control Fast Conditionals Fast Loops String Optimization String Concatenation Trimming Strings Avoid Long-Running Scripts Yielding Using Timers Timer Patterns for Yielding Summary 8. Scaling with Comet How Comet Works Transport Techniques Polling Long Polling Forever Frame XHR Streaming Future Transports Cross-Domain Effects of Implementation on Applications Managing Connections Measuring Performance Protocols Summary 9. Going Beyond Gzipping Why Does This Matter? What Causes This? Quick Review The Culprit Examples of Popular Turtle Tappers How to Help These Users? Design to Minimize Uncompressed Size Educate Users Direct Detection of Gzip Support 10. Optimizing Images Two Steps to Simplify Image Optimization Image Formats Background Characteristics of the Different Formats More About PNG Automated Lossless Image Optimization Crushing PNGs Stripping JPEG Metadata Converting GIF to PNG Optimizing GIF Animations Smush.it Progressive JPEGs for Large Images Alpha Transparency: Avoid AlphaImageLoader Effects of Alpha Transparency AlphaImageLoader Problems with AlphaImageLoader Progressively Enhanced PNG8 Alpha Transparency Optimizing Sprites ?ber-Sprite Versus Modular Sprite Highly Optimized CSS Sprites Other Image Optimizations Avoid Scaling Images Crush Generated Images Favicons Apple Touch Icon Summary 11. Sharding Dominant Domains Critical Path Who’s Sharding? Downgrading to HTTP/1.0 Rolling Out Sharding IP Address or Hostname How Many Domains How to Split Resources Newer Browsers 12. Flushing the Document Early Flush the Head Output Buffering Chunked Encoding Flushing and Gzip Other Intermediaries Domain Blocking During Flushing Browsers: The Last Hurdle Flushing Beyond PHP The Flush Checklist 13. Using Iframes Sparingly The Most Expensive DOM Element Iframes Block Onload Parallel Downloads with Iframes Script Before Iframe Stylesheet Before Iframe Stylesheet After Iframe Connections per Hostname Connection Sharing in Iframes Connection Sharing Across Tabs and Windows Summarizing the Cost of Iframes 14. Simplifying CSS Selectors Types of Selectors ID Selectors Class Selectors Type Selectors Adjacent Sibling Selectors Child Selectors Descendant Selectors Universal Selectors Attribute Selectors Pseudo-Classes and Pseudo-Elements The Key to Efficient CSS Selectors Rightmost First Writing Efficient CSS Selectors CSS Selector Performance Complex Selectors Impact Performance (Sometimes) CSS Selectors to Avoid Reflow Time Measuring CSS Selectors in the Real World Appendix: Performance Tools Index
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