jQuery 1.4 Released, Happy 4th Birthday jQuery

来自jquery官方网站的消息 ，目前最流行的JavaScript/Ajax库jQuery新版本1.4已经发布，为jQuery项目4周年14天庆祝送上一份大礼。

　　1.4的压缩版只有23K，未压缩版154K。此外，Google也在自己的服务器上提供了副本，作为Google Ajax API的一部分，可以直接引用。

　　jQuery 1.4对代码库进行了内部重写组织，开始建立一些风格规范。老的core.js文件被分为attribute.js, css.js, data.js, manipulation.js, traversing.js和queue.js。CSS和attribute的逻辑分离。并修正了207个老版本的错误。

　　主要新特性有：

　　1. 常用方法的性能大幅提升 。重写了大部分较早期的函数。

　　2. 更容易使用的设置函数 （setter function）。为所有对象新增了许多易用的设置函数。

　　3. Ajax方面的改进 。引入了许多Ajax和JSON处理方面的更新，包括HTML5元素的序列化。

　　此外，attribute（改进了.attr()的性能）、jQuery()核心函数、CSS（.css()性能有两倍提升）、特效和事件、DOM操作等也有显著改进。

翻译自：http://techie-buzz.com/internet-tools/jquery-14-released-on-4th-jquery-birthday.html

以下是官方文档：

JQuery 1.4 Roadmap

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ROUGH NOTES This is just some rough notes for things to look at for 1.3.x/1.4.

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Core

• jQuery.require (require JavaScript modules and CSS to load before ready runs)

 jQuery.require("foo.js");


 jQuery.require("foo2.js");


 jQuery(function(){ ... });

See also xLazyLoader

• Dynamic loading of modules when they're needed (would require synchronous script loading in core)
• $.ready failover. If not enough functionality is provided, have ready gracefully not load.
• Widget Factory
• .toArray() (As alternative to .get())
• .get(-1) Allow for negative numbers to .get().
• $.isObject() (Possibly for use by deep extending)
• Use $.isArray() and $.isObject() for deep extending Discussion , Discussion
• Implicit ready event like Mike Alsup is doing with his plugins now .

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DOM

• $.contains (determine if an element is inside another one)

 jQuery("div").contains(DOMElement)

• Forcefully remove html/head/body from HTML injection
• Handle HTML injection in XML documents (serialize a DOM then insert)
• Use .outerHTML to cleanup after .remove()
• Implement a .extract()/.detach() method (remove the element from the DOM, leaves events and data intact) Discussion 1 , Discussion 2
• .not() should accept a function for filtering
• .filter() should accept an Element, Selector, or Array
• .index() (no arg) gives you the position of the element amongst its siblings
• .children() should be sorted in order
• .after() should act like .add() if the elements are disconnected.
• .before() should work similarly, as well.

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Selectors

• Force document order for comma-separated queries. Discussion (In 1.3.2)
• Use querySelectorAll for element-rooted queries. Discussion
• Piggy-back on a central data cache, if one exists.
• "#id p" should be as fast as $("#id").find("p") (In 1.3.3)

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Attributes / CSS

• Rewrite (reorganize and separate these two pieces of functionality) (reorganized and separated in 1.3.3)
  • Use only camelCase for styles
  • Related: Fix camelCase of animation styles
  • Why is Math.max used in height/width? Should be removed? (Needed: IE freaks out with negative numbers)
• Deactivate alpha filter in IE when set to 1.0
• Get filter value from stylesheet for alpha
• Allowing a function as the "setter" argument for .css() -- like we have in .attr() -- and maybe for .val(), .html(), and .text() as well.
• Allow retrieval of multiple attributes/styles using a space separated string
• Enhance .toggleClass (in 1.3.3)
• .radioClass()
• colSpan

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Data

• A way to copy all data from one element to another.

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Offset

• Make offset and position a setter offset setter plugin
• Faster Initialization (in 1.3.3)
• Use parseFloat (in 1.3.3)
• boundingClientRect check (in 1.3.3)

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Events

• Have <img>.load check for .complete in IE (in case the file was already loaded and cached) Discussion
• Add the mousewheel event to core
• Adapt mouseenter/mouseleave to work with live
• Multiple binding with namespaces
• Event scoping Discussion ticket (in jQuery 1.3.3)
• .live()
  • $("foo", context).live(...) (in 1.3.3, might have issues with closest method not respecting context though)
  • Implement .live("change") see also
  • Implement .live("submit")
  • Implement .live("blur/focus")
• Do garbage collection asynchronously
• Events should be stored as an array [1] (Also, need a ticket on Chrome executing events out of order.)
• Iframe load event not possible Discussion

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Ajax

• Use JSON API if available to parse JSON. More info
• Remove type cruft from $.get
• Add some extra simple arguments to $.ajax.

 $.ajax(type, url, options);

• Support options argument in $.get and $.post

 $.get(url, data, dataType, options);


 $.post(url, data, dataType, options);

• Improved $.param serialization
• Dynamic loading of stylesheets
• Look at headers to make intelligent decisions about the content-type

[ edit ]

Effects

• Synchronized animations (Sync multiple animations together)
• fadeTo show also show the element, if it's hidden. (in 1.3.3)
• Animate to end value of 'auto'

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Structure

• Reduce the number of function calls needed for common jQuery methods
• Split up jQuery structure into smaller modules (core, traversing, manipulation, attributes/css)
  • This was done in r6283 (for 1.3.3), although there are some dependency issues to work out
• Make it possible to only load the core module and be able to load all the rest dynamically
  • Seems like this would force us to expose a lot of the private methods/properties we have right now and potentially ditch the use of a closure.
• Passing the XHTML test suite
• Passing Object.prototype tests
• Cache static objects
• Standardize RegExp usage (in 1.3.3)
• Improve RegExp Callbacks (in 1.3.3)
• Working in evalInSandbox
• Keep a separate data() cache for the document object (to avoid any obvious pollution).
• Work as a Caja Gadget [2] [3]

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Testing

• Runnable DOM Ready tests
• Object.prototype tests
• Integrate test suites from plugins into jQuery test suite

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Misc

• Work on the jQuery Core Style Guidelines
• Make sure that we pass Spidermonkey/Rhino Strict
• Include that check into the build process