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

Javascript
JavaScript 继承详解（四）
兼容IE/Firefox/Opera/Safari的检测页面装载完毕的脚本Ext.onReady的实现
js 实现无缝滚动 兼容IE和FF
js 对象是否存在判断
优化 JavaScript 代码的方法小结
表单元素事件 (Form Element Events)
js 动态创建 html元素
prototype 学习笔记整理
JavaScript 创建对象
javascript 全角转换实现代码
DOM 基本方法
用showModalDialog弹出页面后，提交表单总是弹出一个新窗口
javascript 动态创建 Option选项
javascript 7行代码画出一个围棋棋盘
比较简单的异步加载JS文件的代码
javascript 层隐藏和显示的代码
自定义滚动条3.0
javascript iframe内的函数调用实现方法
Prototype Class对象学习
Prototype RegExp对象 学习

No. « 146 147 148 149 »

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: 356 ::
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('');
}