ECMAScript 5与HTML5 的支持情况

ECMAScript 5与HTML5离我们越来越近了,触摸屏相关的API开发中,未来的web世界更加多姿多彩。

Object.getPrototypeOf

支持浏览器:firefox3.6 chrome4

http://codereview.chromium.org/518056

Object.getOwnPropertyDescriptor

支持浏览器:IE8 chrome4

http://code.google.com/p/chromium/issues/detail?id=20345

Object.keys

支持浏览器: chrome4

http://code.google.com/p/chromium/issues/detail?id=21767

Object.defineProperty

支持浏览器: IE8

http://msdn.microsoft.com/en-us/library/dd548687(VS.85).aspx

https://developer.mozilla.org/en/Core_JavaScript_1.5_Reference/Global_Objects/Object/defineProperty

Object.create

支持浏览器: chrome4

http://msdn.microsoft.com/en-us/library/dd548687(VS.85).aspx

Object.getOwnPropertyNames

支持浏览器: chrome4

http://code.google.com/p/v8/source/detail?r=3620

关于Object的扩展,可以看John Resig的这一篇博文《ECMAScript 5 Objects and Properties》

JSON

支持浏览器: IE8 chrome1+ safari3+ firefox3+


JSON.parse( text, translate )

JSON.stringify( obj, translate )

String.prototype.toJSON

Boolean.prototype.toJSON

Number.prototype.toJSON

Date.prototype.toJSON

http://blog.mozilla.com/webdev/2009/02/12/native-json-in-firefox-31/

http://blogs.msdn.com/ie/archive/2008/09/10/native-json-in-ie8.aspx

Date.now

支持浏览器: chrome4 firefox2+ safari4

http://trac.webkit.org/changeset/33422

https://developer.mozilla.org/en/Core_JavaScript_1.5_Reference/Global_Objects/Date/now

Date.prototype.toISOString

支持浏览器: chrome4 firefox3.6 safari4

https://bugs.webkit.org/show_bug.cgi?id=26594

String.prototype.trim

支持浏览器: chrome1+ firefox3+

https://bugs.webkit.org/show_bug.cgi?id=26590

http://code.google.com/p/v8/issues/detail?id=465

https://developer.mozilla.org/En/Core_JavaScript_1.5_Reference/Global_Objects/String/Trim

“Array extras”

Array.prototype.{indexOf,lastIndexOf,every,some,forEach,map,filter,reduce,reduceRight}

IE8全部不支持,Opera不支持reduce,reduceRight,chrome与safari与firefox早就实现了

https://developer.mozilla.org/en/New_in_JavaScript_1.6#Array_extras

Array.isArray

支持浏览器: chrome4 opera10.50

http://codereview.chromium.org/271072

ECMAScript 5 Getters and Setters

这是旧有的javascript不能模拟的新特性!


o = {

  a:7,

  get b() { return this.a+1; },

  set c(x) { this.a = x/2; }

};

https://developer.mozilla.org/en/Core_JavaScript_1.5_Guide/Creating_New_Objects/Defining_Getters_and_Setters

支持浏览器:Firefox 2.0+, Safari 3.0+, Chrome 1.0+, Opera 9.5+

非标准,Firefox1.5里的旧方法


HTMLElement.prototype.__defineGetter__("innerHTML", function () {});

HTMLElement.prototype.__defineSetter__("innerHTML", function (val) {});

支持浏览器:Firefox 2.0+, Safari 3.0+, Google Chrome 1.0+, Opera 9.5+

标准


Object.defineProperty(document.body, "innerHTML", { get : function () {} });

MSDN文档:http://msdn.microsoft.com/en-us/library/dd229916(VS.85).aspx

支持:IE8+ (只能对DOM使用)

HTML5 DOM Storage

window.localStorage

window.sessionStorage //可跨域,标签页关掉就清空

支持浏览器:Firefox 3.5+, Safari 4.0+, IE 8.0+

http://www.w3.org/TR/webstorage/

http://www.quirksmode.org/dom/html5.html#localstorage

https://developer.mozilla.org/en/DOM/Storage

http://msdn.microsoft.com/en-us/library/cc197062(VS.85).aspx

HTML5 Offline Application Cache

用一个manifest文件缓存静态资源(图片,css, js之类)在离线状态下使用,不是结构化数据


<html manifest="foo.manifest">

<h1>Entry</h1>

</html>

支持浏览器:Firefox 3.5+

http://www.w3.org/TR/offline-webapps/#offline

https://developer.mozilla.org/en/Offline_resources_in_Firefox

HTML5 Web SQL Database Storage

//2007年就实现了!

var database = openDatabase("Database Name", "Database Version");



database.executeSql("SELECT * FROM test", function(result1) {

   // do something with the results

   database.executeSql("DROP TABLE test", function(result2) {

     // do some more stuff

     alert("My second database query finished executing!");

   });

});

支持浏览器:Safari, iPhone OS 3, Opera 10.50,chrome4

http://webkit.org/blog/126/webkit-does-html5-client-side-database-storage/

http://www.weboshelp.net/getting-started-with-webos/156-palm-webos-html5-database-storage-tutorial/

HTML5 Web Workers

实现多线程!?


var worker = new Worker("worker.js");

// Watch for messages from the worker

worker.onmessage = function(e){

  // The message from the client:

  e.data

};



worker.postMessage("start");

支持浏览器:firefox3.1+

http://www.w3.org/TR/workers/

https://developer.mozilla.org/En/Using_web_workers

日本人用它来实现的框架

HTML5 Geolocation

支持浏览器:FF3.5+, iPhone OS 3

http://www.w3.org/TR/geolocation-API/

https://developer.mozilla.org/En/Using_geolocation

HTML5 Drag and Drop

原生拖放API

支持浏览器:IE8, Safari 4, FF3.5

IE8如果报错,请刷新当前页面……

http://www.w3.org/TR/html5/editing.html#dnd

https://developer.mozilla.org/En/DragDrop/Drag_and_Drop

HTML5 Video

支持浏览器:Safari 4, FF3.5,chrome3+

https://developer.mozilla.org/En/Using_audio_and_video_in_Firefox

http://webkit.org/blog/140/html5-media-support/

HTML5 audio

支持浏览器:Safari 4, FF3.5,chrome3+

HTML5 canvas

支持浏览器:IE以外所有新锐浏览器

https://developer.mozilla.org/en/Canvas_tutorial

HTML5 SVG

支持浏览器:Firefox 1.5+, Safari 3.0+, Chrome 1.0+, Opera 9.0+

http://www.w3.org/TR/SVG12/

http://www.ibm.com/developerworks/cn/views/xml/tutorials.jsp?cv_doc_id=84896

HTML5 XMLHttpRequest 2与跨域

支持浏览器:IE8与firefox3.5+各实现了部分

http://www.w3.org/TR/XMLHttpRequest2/

https://developer.mozilla.org/En/Using_XMLHttpRequest#Monitoring_progress

http://msdn.microsoft.com/en-us/library/cc197057(VS.85).aspx

http://www.w3.org/TR/cors/

https://developer.mozilla.org/En/HTTP_Access_Control

http://msdn.microsoft.com/en-us/library/cc197057(VS.85).aspx

HTML5的标签变更情况:

http://www.w3schools.com/html5/html5_reference.asp


上述特征的支持情况只对目前有效……

2012年1月16日,by司徒正美

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