当前位置: 首页 > 图文教程 > 网络编程 > Javascript > lib.utf.js

Javascript
Javascript 学习笔记 错误处理
Javascript 类的继承实现代码
JavaScript 创建对象和构造类实现代码
JavaScript 学习小结(适合新手参考)
extjs 列表框(multiselect)的动态添加列表项的方法
javascript getElementsByName()的用法说明
Document 对象的常用方法
JS 事件冒泡 示例代码
JS 面向对象的5钟写法
JS 输入字数判断实现代码
Javascript 汉字字节判断
JavaScript 关键字屏蔽实现函数
一句话JavaScript表单验证代码
利用javascript实现一些常用软件的下载导航
jQuery 相关控件的事件操作分解
JavaScript 异步调用框架 (Part 1 - 问题 & 场景)
JavaScript 异步调用框架 (Part 2 - 用例设计)
JavaScript 异步调用框架 (Part 3 - 代码实现)
JavaScript 异步调用框架 (Part 4 - 链式调用)
JavaScript 异步调用框架 (Part 5 - 链式实现)

No. « 150 151 152 153 »

技术文章搜索

关键字

Javascript 中的 lib.utf.js

出处:互联网   整理: 软晨网（RuanChen.com）   发布: 2009-09-12   浏览: 350 ::
收藏到网摘: n/a 

/* UTF-8 <=> UTF-16 convertion library.
 *
/* Copyright (C) 1999 Masanao Izumo <[email protected]>
 * 2007 Ma Bingyao <[email protected]>
 * Version: 2.1
 * LastModified: Feb 25, 2007
 * This library is free. You can redistribute it and/or modify it.
 */

/*
 * Interfaces:
 * utf8 = utf16to8(utf16);
 * utf16 = utf16to8(utf8);
 */

function utf16to8(str) {
 if (str.match(/^[\x00-\x7f]*$/) != null) {
 return str;
 }
 var out, i, j, len, c, c2;
 out = [];
 len = str.length;
 for (i = 0, j = 0; i < len; i++, j++) {
 c = str.charCodeAt(i);
 if (c <= 0x7f) {
 out[j] = str.charAt(i);
 }
 else if (c <= 0x7ff) {
 out[j] = String.fromCharCode(0xc0 | (c >>> 6),
 0x80 | (c & 0x3f));
 }
 else if (c < 0xd800 || c > 0xdfff) {
 out[j] = String.fromCharCode(0xe0 | (c >>> 12),
 0x80 | ((c >>> 6) & 0x3f),
 0x80 | (c & 0x3f));
 }
 else {
 if (++i < len) {
 c2 = str.charCodeAt(i);
 if (c <= 0xdbff && 0xdc00 <= c2 && c2 <= 0xdfff) {
 c = ((c & 0x03ff) << 10 | (c2 & 0x03ff)) + 0x010000;
 if (0x010000 <= c && c <= 0x10ffff) {
 out[j] = String.fromCharCode(0xf0 | ((c >>> 18) & 0x3f),
 0x80 | ((c >>> 12) & 0x3f),
 0x80 | ((c >>> 6) & 0x3f),
 0x80 | (c & 0x3f));
 }
 else {
 out[j] = '?';
 }
 }
 else {
 i--;
 out[j] = '?';
 }
 }
 else {
 i--;
 out[j] = '?';
 }
 }
 }
 return out.join('');
}

function utf8to16(str) {
 if ((str.match(/^[\x00-\x7f]*$/) != null) ||
 (str.match(/^[\x00-\xff]*$/) == null)) {
 return str;
 }
 var out, i, j, len, c, c2, c3, c4, s;

 out = [];
 len = str.length;
 i = j = 0;
 while (i < len) {
 c = str.charCodeAt(i++);
 switch (c >> 4) { 
 case 0: case 1: case 2: case 3: case 4: case 5: case 6: case 7:
 // 0xxx xxxx
out[j++] = str.charAt(i - 1);
 break;
 case 12: case 13:
 // 110x xxxx 10xx xxxx
c2 = str.charCodeAt(i++);
 out[j++] = String.fromCharCode(((c & 0x1f) << 6) |
 (c2 & 0x3f));
 break;
 case 14:
 // 1110 xxxx 10xx xxxx 10xx xxxx
c2 = str.charCodeAt(i++);
 c3 = str.charCodeAt(i++);
 out[j++] = String.fromCharCode(((c & 0x0f) << 12) |
 ((c2 & 0x3f) << 6) |
 (c3 & 0x3f));
 break;
 case 15:
 switch (c & 0xf) {
 case 0: case 1: case 2: case 3: case 4: case 5: case 6: case 7:
 // 1111 0xxx 10xx xxxx 10xx xxxx 10xx xxxx
c2 = str.charCodeAt(i++);
 c3 = str.charCodeAt(i++);
 c4 = str.charCodeAt(i++);
 s = ((c & 0x07) << 18) |
 ((c2 & 0x3f) << 12) |
 ((c3 & 0x3f) << 6) |
 (c4 & 0x3f) - 0x10000;
 if (0 <= s && s <= 0xfffff) {
 out[j] = String.fromCharCode(((s >>> 10) & 0x03ff) | 0xd800,
 (s & 0x03ff) | 0xdc00);
 }
 else {
 out[j] = '?';
 }
 break;
 case 8: case 9: case 10: case 11:
 // 1111 10xx 10xx xxxx 10xx xxxx 10xx xxxx 10xx xxxx
i+=4;
 out[j] = '?';
 break;
 case 12: case 13:
 // 1111 110x 10xx xxxx 10xx xxxx 10xx xxxx 10xx xxxx 10xx xxxx
i+=5;
 out[j] = '?';
 break;
 }
 }
 j++;
 }
 return out.join('');
}