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Encoding in javascript


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Encoding in javascript

  1. 1.
  2. 2. Encoding in JavaScript<br />fahai [at] TaobaoUED<br />
  3. 3. ECMA 262 - §6<br />ECMAScript source text is represented as a sequence of characters in the Unicode character encoding, version 2.1 or later, using the UTF-16 transformation format. The text is expected to have been normalised to Unicode Normalised Form C (canonical composition), as described in Unicode Technical Report #15.<br />Conforming ECMAScript implementations are not required to perform any normalisation of text, or behave as though they were performing normalisation of text, themselves.<br />
  4. 4. SourceCharacter :: any Unicode character<br />
  5. 5. Rhino Book - §3.2<br />JavaScript programs are written using the Unicode character set.<br />Although the ECMAScript v3 standard allows Unicode characters anywhere in a JavaScript program, versions 1 and 2 of the standard allow Unicode characters only in comments and quoted string literals; all elements are restricted to the ASCII character set. Versions of JavaScript that predate ECMAScript standardization typically do not support Unicode at all.<br />
  6. 6. Code-point, not byte<br />
  7. 7. Example<br />var草泥马 = function() {<br />this.constructor.prototype.咆哮 = function(叫声) {<br /> alert(叫声);<br /> };<br />};<br />new 草泥马().咆哮("除尽天下河蟹日,家祭无忘告乃翁!");<br />
  8. 8. Example<br />alert(String.fromCharCode(35201, 21644, 35856, 65292, 35201, 26377, 29233));<br />
  9. 9. related functions<br />escape()<br />encodeURI()<br />encodeURIComponent()<br />
  10. 10. Reference<br />ECMAScript Specification - 3rd Edition<br />JavaScript - The Definition Guide - 5th Edition<br />
  11. 11. Thanks<br />